Hang on Refugium 6/15/08
Thanks for such a wonderful site, I've been reading for 4 years, but this is my first question.
<Welcome to WWM!>
(Couldn't find answer with a search) I want to add a hang on refugium to my 200 gal. set up, but wondered if I could hang it on my 30 gal. sump instead of the display tank. Thanks! Cathie
<So long as you have sufficient light for any macroalgae you may want to grow (some HOB’s rely on the tank’s light), this will workout fine. Welcome, Scott V.>

Re: HOB Refugium Break 6/4/08
Thank you so much! I was able to repair the refugium and the tank is all set up and cycling away!
<Great, a pleasure to help out!!>
Your site is absolutely wonderful...my only complaint is that I am now completely addicted and getting very little work done :)
<It very much becomes a lifestyle very quickly.>
Thanks again!
Tamara
<Welcome, have fun, Scott V.>
 

HOB refugium on a 10G nano 05/31/2008 Hello lifesavers! <<Hello Sonny, Andrew this evening>> Right now I have a 10G nano tank with 20 lbs of live sand, and approx 15 lbs of live rocks. For filtration I run a Marineland C-160 canister and a AquaC remora nano skimmer+ Hydor Koralia powerhead. The tank has been set up about 7 month ago. I have a six line wrasse, a cleaner shrimp, some Nassarius(or something like that:-) sand snails, few crabs. I have a trumpet and colt coral, a chili cactus, red and blue mushroom colonies, a GSP, some zoos and a clam. <<A very busy 10g nano there>> I am seriously thinking about set up a HOB refugium. What do you think about the Ecosystem 40? Sounds like a great, beneficial refugium. I've never had one before. Would that be enough for filtration? <<Yes, I think it would be very good for your system. A nice piece of equipment indeed>> In case I'll set up one, can I get rid of the canister filter? <<You have adequate amounts of live rock to provide the filtration, so, yes, you can remove the canisters>> The one I keep my eyes on has a built in modified Prizm skimmer. What about the chemical filtration? Can I place Chemi-pure or carbon anywhere inside the refugium? <<No, I would not. all you want in a refugium is sand, rock rubble and macro algae. You could remove the media from the filter, and run chemical filtration in that>> O.k., let's skip the crap.. The main question is : A HOB refugium with all the good microalgaes and sand inside + a skimmer would be enough filtration for my tank? <<Yes>> I appreciate your time, Sonny <<Thanks for the questions, hope this helps. A Nixon>> Re: HOB refugium on a 10G nano 06/02/2008 Thank you very much Andrew! <<No problem, glad to help>> Just one more thing I forgot to ask. Would that be ok to switch the canister to the refugium right away? Wouldn't it be breaking the biological cycle in my 10G tank? 3.5 G of new saltwater and the live sand added to the refugium might break the nitrogen cycle.. <<No, it wont, will be fine as the live rock can cater for dealing with bacteria levels on its own after this amount of time being in the tank>> Don't you think? Is there any beneficial difference between miracle mud and aragonite? (I know it's two questions, but hey, I love you guys:-) <<Personal preference. I am a sand lover, where as others i know are mud lovers.>> I really appreciate all the effort you folks put into this website! The Harvard library can do you a favor... Thanks again, <<Thanks for the follow-up Sonny. Good luck. A Nixon>>

Hang on Refugium 3/22/08
Hi, <Hello> I have yet another question regarding a hang on refugium.
<OK>
I have a 65 gal tank with 120lbs of live rock and 60lbs of Live sand. I am using a canister filter for mechanical filtration (Chemi-pure). I also am using a protein skimmer, Phos ban reactor, and uv sterilizer. I have a half dozen zoo's and yellow polyps I have a very small bio load, an Anthias, and a Flasher Wrasse (plan on adding a tang),
<I would not add the Tang, they need more swimming space than this.>
various shrimps, lobster and snails. I want to add a hang on refugium, I only have room for the small size, and I want to hang it on the side of the tank. Will this be beneficial to the tank? Will the weight be ok hanging on the side of the tank?
<Yes, not a problem.>
I have asked this question to various LFS in the area. Some have said that it will do nothing, and
then others have said that it will definitely be beneficial, and reduce nitrates.
<It will be beneficial, especially with the addition of macroalgae. Larger is better with a refugium, but something is also better than nothing!>
Thanks in advance. I really enjoy your website and reading all the feedback you provide.
Anthony
<Welcome, thank you, Scott V.>

Tiny Refugium 11/3/07
Hello again,
<Hello, love the name.>
I was reading about refugiums in Reef Invertebrates An Essential Guide to Selection, Care and Compatibility today when I saw a small section that said a small refugium is better than none at all. My 50 gallon tank sits approximately 3" away from the wall with an Aqua C Remora Protein Skimmer hanging on the back already I was wondering if it would be worth building a hang off refugium in the same manner as the protein skimmer dimensions 24"wx18"tx3"d with the pump in the middle and a run off on both sides sort of like the larger bio-wheel filters.
<You very well could do this, and worth doing. Check out Steven Pro’s article on converting a Aquaclear 500 into a hang on the back refugium for some ideas.
http://www.wetwebmedia.com/hagenrefugart.htm
You will need some sort of baffle inside to keep you macroalgae in the refugium and not your tank.>
Something to breed pods for the mandarin is it possible/safe? What other possible uses could I have with only 3" depth between the tank and wall? I was considering putting LS either way but I'm not sure the extra weight/stress on the tank is worth it.
<The weight will be fine for the volume we are talking about. Your tank is really too small to accommodate and feed a mandarin, even with the addition of the refugium. They require a large (on the order of 100 gallons plus per fish) rock filled tank to provide enough food to sustain these fish.>
Thanks,
Overly Creative
<Keep innovating, thank you, Scott V.>

Bak Pak refugium 10/26/07
Hey guys,
<Hello, Scott V here. >
I was wondering if there is anyway to turn my Bak Pak BioBale area into a Refugium? I have searched online with no outcome so I am guessing not.
<Could be done, but not much volume there. The problem I see is your macro of choice would grow so fast or be floating up in the water flow and constantly choking off the skimmer return. Also, with this design the refugium would only be seeing skimmed water. Possible, just tough to do safely and with limited benefit. You could consider buying or making a hang on the back refugium, or even an upstream (above the tank) type fed by a small powerhead. Please check out http://www.wetwebmedia.com/hagenrefugart.htm for more ideas.>
I've been reading your FAQs for the last 2 months and this is my first time emailing you guys. YOU GUYS live ROCK!
<Thank you very much, love that last line. Welcome to WetWebMedia.com, a refugium is definitely a worthwhile endeavor, Best Fishes, Scott V.>

Hang on Refugium - Weight/strain concern  8/13/07
Hi There,
<Hi Karl>
I wonder if you could help me with a concern that I have? I have just purchased a Hang On Octopus Refugium with dimensions 14inch (36cm) length x 10inch (26cm) deep x 3inch (8cm). I have calculated the volume of this as 1.82 (US Gal) / 1.52 (UK Gal). I plan to use this on a Juwel Lido 120 (31.70 US Gal / 24.40 UK Gal) - the tank is nearly 24" tall. The glass on this tank I measure to be 6mm and the tank is not braced. My question is this, will this be too heavy to hang on the side of the tank - will this break the glass? This is the smallest refugium that I have been able to find, and whilst I know that it will not be full to the top - I am concerned that once it has some sand, small little piece of LR and water it could break my tank.
If you could let me know what you think it would be much appreciated!
<No problem here. These units are designed to hang on tanks.>
Thanks very much!
<You're welcome. James (Salty Dog)>
Cheers,
Karl

Chemical filtration placement question for a hang-on refugium   6/24/07
Good evening,
I first want to thank you for your site and all the great information, I don't know if I could have survived this hobby without it. My question is as follows: When adding chemical filtration, specifically Chemi-pure, where should I place it in a CPR hang on refugium/ skimmer unit. I just purchased Chemi-pure and had it in the compartment after the skimmer and now it seems that the Caulerpa in the refugium is turning white and breaking apart. I thought about putting it in front of the return portion of the unit,
<Mmm>
but I am fearful that the copepods and stuff that is supposed to leak into the main tank from the refugium wont.
<Not to worry re this...>
The only filtration I currently have is live rock and the CPR and would love to add the Chemical filtration, but the only option I have is to place it in the refugium. I used to use carbon in my Prizm and thought it really helped. I would therefore like to continue with the added filtration with my new set-up.
Thank you in advance for all of your help!!
Cory
<Somewhere in the filter flow path, though not blocking same... toward the exit, return, though most anywhere in this unit would be fine... I would only switch such a product out once a month... using two would be best, leaving one in while changing the oldest each interval. Bob Fenner>

Ecosystem Product Quality, Hang-On-Refugium  5/31/07
Hi there,
<Hello.>
I read your web site, it's very helpful and comprehensive.
<Thanks.>
I plan to buy Ecosystem pro 40 for my 42 gal. glass tank with coral & fish, my tank is running the canister filter now, I plan to keep it together with hang-on one.
<Sounds good.>
Here is my questions:
1) Any feedback/idea about the Ecosystem pro 40.
<A good choice for a hang-on-fuge, Leng Sy makes quality products.>
2) Should I cycle the hang-on separately with my existing tank?
<It shouldn't need to cycle per se, however do keep the hang on fuge separate until the mud settles.>
3) Should I put sand & mud in the hang-on?
<You can though I don't see the need for both.>
You mentioned that it should stay away Caulerpa,
<Not me personally...though I have other choices.>
so what else of algae is more appropriate
<Chaetomorpha is quite popular and effective.>
....Please name and the reason.
<My thoughts on this and, the rest of the crews, is posted on WWM.>
4) The refugium light should stay on 24/7 as manufacture's recommendation or else.
<Mmm...this depends on the algae in question many do need a resting period.>
Thanks in advance for your help
<Anytime.>
Hanson
<Adam J.>

Terrible mess!! Refugium Problems 3/22/07
Hi everyone!
<Hello Pam>
Now, I know there are a zillion articles on refugiums,
<More than that:)>
and I have even emailed you about this particular problem, BUT, the problem still exists!
<Not good.>
I siphoned all the water from my refugium, took out the scum, sludge and low tide stench goop, removed top two inches of sand, and started with new plants, Chaetomorpha algae.
Not only are the Chaetomorpha algae turning brown with the same sludge, the entire unit has become brown with the same conditions as before. it took only one week for this to start turning bad AGAIN!
<One important question.  What are you using for light over the fuge?>
This is a hang on refug. with 5 inches of live sand, and "MUD'' together.
<Would not mix dissimilar products, grain size, composition, etc.  I would redo and stick with Miracle Mud, about two inches
deep will do.>
The skimmer is producing but not to a great degree.
<Cleaning the skimmer, especially the riser tube, will make skimming much more efficient.>
I am also surprised by the lack of flow in the refug. It just seems to barely break over the built in partitions to flow back into the tank.
I am so frustrated by this.
<Refugiums should not have a high water flow, in your HOB, 100gph should be fine.>
It is no easy task to break down a refugium. It's just a  terrible mess.
What's wrong? !!
I hope you have the answer!!!
<Wish you would have provided more info, such as water parameters, frequency of water changes, bio-load, ample supply of critters in
the refugium, etc.  Do provide and I may be able to steer you in the right direction.>
thank you!
<You're welcome.  James (Salty Dog)>
Pam

H.O.B. Aqua Fuge. Adding Refugium to Established Tank   3/15/07
Hello,
<Hi.>
I hope all is well with the "Crew".
<Yes, thanks.>
I have a question regarding a  H.O.B. refugium.
<Okay.>
A good friend and fellow reefer is going to give me a  H.O.B. refugium that is 18"x4"x12".
<Neat gift.>
  I think it is around 3g.  I  maintain an established: 3 yr. old 55g reef SPS/ LPS, 70+#  LR, 3" LS bed, Vanuatu mystery wrasse, blue streak cleaner wrasse ( 2.5yr),  pseudo. elongatus, geometric pyg. hawk, Pacific candy hog, 48" Current SunPod  2x150w HQI 14K. Remora Pro-Mag 3, 2-Seio 620.
Would it be better to add Miracle Mud or live sand
<Either or your choice, the mud isn't cheap though.>
and would either of these two items cause a mini cycle in the  system?
<Somewhat perhaps, I would counteract this with using sand/rock from an already established system or quarantining them prior to use in your display...of course extra water changes and having some carbon handy wouldn't be a bad idea either.>
  Also what would be the best algae to grow in the fuge that would  be lit by a 24w PC bulb on a reverse cycle from the main tank?
<Chaeto seems to be the popular, easy to get stuff, at the moment but there are other options, do read up on WWM and the Fenner/Calfo book "Reef Invertebrates" if you have a copy handy.>
Any info  and help appreciated thanks,
<Anytime.>
Mile.
<Adam J.>

Re: NNR and Hang on Tank Refugium  3/5/07
What a great reply.  Thanks.  So should I even bother with the hang on?
<I would not... too small, not a great savings in terms of what one can make themself...>
  You recommend a refugium that's 20% to 40% of the tank capacity.  But that was for food production.
<Mmm, not alone, no. Many benefits... that accrue with size>
  Do you recommend the same capacities for NNR?
<Yes. Bob Fenner>
By the way, Bob, I haven't gotten the Monty Python response in year.
Excellent recall.
<Heeee! "Is that an African or English Sparrow?" BobF>
What have the Romans done for us anyhow?

So Confused (finding the right wet dry filter) Wet/Dry Sump/Refugium 2/15/07
In my recent questions ,Mixing, Matching, and Modifying a Stocking Plan, I asked you about a certain wet dry filter. I did some research and came up with hardly anything. Not a lot of people have bought it (being the skimmer and pumps). So now I'm on a quest, for myself, to find something like the wet dry filter I explained to you (with a protein skimmer, refugium, sump, light, and other needed accessories; all in one package). The filter's going to be for a 55 gallon aquarium and I'm willing to pay up to $500. Do you know of any Best Brands (BB's) that are like the system I explained to you ; all in one package, remember? If not, could YOU tell me what all I can put together to make the filter like the one I want (since you are the professional and all)?
Sorry for the commands and thanks for answering (even if you don't give me the answer I want. LOL!)
<Jeffrey, I do know of one.  I believe CPR makes it.  It is called the AquaFuge Pro Kit.  It includes external filter/refugium, Rio 600 pump to run the protein skimmer (which is included), and a two PC (36 watt total) light fixture.  The return pump and pre-filter return are optional.  This unit sells for
around 450.00 at various etailers.  Foster & Smith sell it for 444.99.  James (Salty Dog)>

New Hang-On Refugium Setup - 10/06/06
Dear Sirs:
<<Hello!  Ladies here too...but no need to be quite so formal>>
Thank you for your recent advice that I am now taking...Add a refugium to my tank.
<<Ah, good>>
I have purchased a 3 gal/18"L/12"D/5"W hang-on refugium and 24w light that I will run at night to counter pH shift.
<<Ok>>
I have 2 questions.
<<Shoot...>>
1: Setup of the refugium -- I have received the following from an
established reef:  Five (5) pounds of Cultured Live Sand, Five (5) pounds of Live Refugium Mud, 50 Live Reef Snails (Ilyanassa obsoleta)
<<Mmm, I'm not sure these are true "tropical" snails...>>
Chaetomorpha - Spaghetti Algae  (a football size ball), Many pounds of established live rock (small to large pieces)
<<Can't be too "many" pounds in this size refugium...especially with 10-pounds of sand and mud already.  But also not really needed here; I would leave the rock out of the refugium to leave more room for the macro-algae>>
What order/method should I place these in the refugium and how much of each?  (i.e. 2" deep Sand bed on bottom, 1" deep mud on top,  Five 1" diameter live rocks, 3" diameter of Chaetomorpha algae floating above, 5 reef snails?) I am only guessing above, please let me know the proper setup.  What ever I don't use, I can put in my fish only tank.
<<Ah, I see now...  I would add 4" of sand with 1"-2" of mud on top...6-8 of the snails...all the Chaetomorpha...a small pile of rock in one corner if you wish (but not necessary).  This can all be added at the same time>>
My goal is water perfection, minerals for my corals (polyps mostly), and copepods.  Second question:  I placed some Chaetomorpha in the return box (bubble filter inside the tank) of my protein skimmer, hoping it would have the water run through the algae.
<<Hmm, probably of negligible benefit...but not going to hurt anything either>>
Some detritus is starting to gather at the top of the algae, should I remove it or will it feed the copepods living in the
algae (I'm sure there are some, it came from an infested tank) or should I sweep it off when I do water changes?
<<Might as well remove during maintenance...more will collect...>>
Thank you for any/all help and keep the great site going,
John
<<You're welcome...and we're trying.  EricR>>

Re: New Hang-On Refugium Setup - 10/30/06
EricR, (or whoever on right now)
<<Tis I...EricR again>>
You had replied to an email that I had sent to you regarding a new refugium setup, first of all thank you.
<<I recall...and you are welcome>>
I have setup the refugium per your specifications:
"I would add 4" of sand with 1"-2" of mud on top...6-8 of the snails...all the Chaetomorpha, EricR"
<<Excellent>>
I let the refugium sit (unattached to tank) with a powerhead inside it and 24hr light on it for over a week (the sand and mud came from an established tank so I felt this was long enough).
<<Indeed...you could have plumbed this to the display from the start>>
After attaching the refugium to the tank and letting it sit for another 3 days to let everything settle then I finally turned on the pump.  Some initial cloudiness has occurred, but not too bad.  After 4 days now the tank is still a little cloudy, but the corals
look healthier than ever and the fish don't look bad either.
<<Hee-hee!>>
Will this cloudiness go away?
<<Yes...as long as you aren't continually stirring the mud, and even then...eventually>>
Is it normal?
<<With very fine/mud substrates, yes>>
Should I be concerned?
<<Nope...will find a balance>>
All water parameters check out normal, but I did a 15% water change anyway, it did not solve the problem.
<<The Chaetomorpha in the refugium will act as a mechanical filter, causing the fine particles to "settle out" as they pass through>>
The only thing that is out of place is the pH, seams to have gone from average of 8.25-8.32 during day (I have a constant monitor)
to 8.16-8.27 now.
<<Hmm...possibly from organic material introduced in the sand/mud...nothing to be concerned with at this point>>
Nothing else has been changed besides the refugium.  My skimmer seams to run a lot more and is collecting light brown water, not the normal dark green I used to get.
<<Picking up some of the particulates in the water>>
The water in the refugium does not look cloudier than the rest
of the tank, and there is a huge ball of macro algae on top of the mud stopping too much water flow from stirring it up.
<<Very good>>
I only have a Maxi-Jet 600 pushing water thru it and seams to not stir up anything in the refugium.
<<Ah, okay...good>>  
The refugium has a blast cover that forces the input water to rise to the top before it moves across the center so the bed doesn’t get disturbed.
<<Mmm...I'll bet if you look closely, some water is pushed down the face of the baffle to the mud bed>>
It also has the same design on the output, forcing the water to top before exiting.  I do leave the 24w PC light on the refugium 24hrs a day, could that be something?
<<Not as far as the cloudiness, I wouldn't think.  But with Chaetomorpha, I would set the lighting on a reverse photoperiod from the display to give it a chance to "rest."  This alga doesn't need to be illuminated 24/7 like the Caulerpa species do>>
My only guess is the snails in there are 'burrowing' snails and might be mixing it up too much?
<<Nah...you probably just introduced/disturbed some VERY FINE SEDIMENTS in the mud that will take a while to settle out>>
Any thoughts?
<<Patience Grasshopper>>
Thank you again,
John
<<Is my pleasure to assist.  Eric Russell>>

R2: New Hang-On Refugium Setup - 11/14/06
EricR,
<<Hey John>>
Hey bud, the saga continues with my refugium...  As per your setup advice, the new refugium with mud/sand/crushed coral/Chaetomorpha is in place and seems to be fine and the cloudiness is gone.
<<Cool>>
I noticed though that the water flowing thru the Chaetomorpha is starting to cause the algae to 'collect' detritus as to the fact that the Chaetomorpha is so thick it's acting as a filter.
<<Yep...as does mine>>
The Ilyanassa obsoleta snails that you were not sure about, seem to be working out, they are literally sitting on top of the algae (outside the water I might add) eating the detritus.
<<Excellent>>
I have about 40 of them in my small 2-gal refugium, but they are slowly finding their way to the exit and into the main tank.
<<Indeed, can't be helped...and is part of what is so desirable about an inline refugium>>
They never have caused problems in the main tank before so I am not worried and they mix up the sand nicely.
<<Excellent>>
The only question about this I have is should I be 'mixing' the algae up to avoid the detritus to settle, or fishnet the detritus out of the refugium, put a rock on top of the algae to cause it to sink more and not let it catch anything, or just let the snails/copepods get at it?
<<The latter...the biota in the refugium will benefit/process the detritus.  If you wish, you can "flip" the algae mat when you periodically harvest the Chaetomorpha>>
------------------------Separate topic------------------
I am interested in a 2.5 gal Nano tank on my desk at my office with a single clownfish.
<<Mmm...am NOT a fan of these small systems, especially in office environments where they frequently get left unattended for days at a time>>
I know I’m going to get yelled at, but I really want to try a very small anemone.
<<Can you hear me yelling!?>>
My office has R.O. water that feeds our water cooler, and with 3/10ths gallon water changes every week and a 13w PC on 2.5 gal tank gives 5.2watts/gal lighting.  I know you're just going to say 'sure it might make it a few months' but do you think with very adamant care (I am more willing to take care of my tank than work ;) it might be possible? (Just maybe?)
<<John, John, John...I would not endorse putting just the clown in this tank, let alone an anemone.  Please do reconsider...>>
Again, thanks for your help, and enjoy the long Thanksgiving weekend coming up.
John
<<Ah, will do that...and the same to you.  Eric Russell...currently enjoying himself on the Big Island of Hawaii>>

Refugiums/Selection 10/4/06
Hello crew,
<Hello Mike>
I have read though the questions on the hang on tank refugiums and did not find my answer. In the future I will be converting a 125 gallon fresh water over to FOWLR. I only have room for hang on tank refugiums. I was thinking about 2 of them on the back of the tank spaced out evenly. It will not be a heavy bio-load, maybe 10-15 small peaceful fish. My question is, are the protein skimmers that come along with some of the refugiums are of the quality to handle this or should I purchase them separately?
<The CPR's incorporate their Bak Pak skimmer in their hang on refugiums.  A decent skimmer, but I would rather go with skimmerless refugiums and an efficient hang-on skimmer.  Seems to me like you are helping to defeat the purpose of a refugium by having a skimmer incorporated into it.  Much better to surface skim water to the skimmer.>
I have a Remora on my 46 gallon now it works great (thanks guys & gals ) on that one. Any input or suggestions will be greatly appreciated and put to good use. Thank you in advance and for all the help in the past, Mike, your fishin buddy.
<You're welcome Mike.  James (Salty Dog)>

Re:  Refugiums/Selection  10/5/06
Thank you for the lighting quick response Salty Dog. The way you explained it makes perfect sense. I will purchase a separate skimmer as suggested.
Thanks again,
<You're welcome, Mike.  James (Salty Dog)>
Mike.

Hang on & in tank fuge? Refugiums/Selection 10/03/06
Hi there,
<Good morning.>
currently have a 55 reef setup with a Fluval 404, Eheim 2213, & Penguin 350 without the bio-wheels, and a Seaclone 150 skimmer.
I'm looking to get rid of the Fluval/Penguin & Seaclone  & replace with a CPR hang on fuge, BakPak 2 Skimmer,  as well as this "in tank " fuge  (the large one of course).
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=3621&Ntt=in%2Dtank%20refugium&Ntk=All&Ntx=mode+matchallpartial&Np=1&pc=1&N=0&Nty=1
I do not have the room or $$$ to have any sump or fuge below or above my tank and I'm wondering if this is a good way to go or not.
<If it were me, I'd go with a hang on the back fuge.  Much larger/useful than the in in-tank model.  In time the in-tank will become unsightly along with minimizing your space for rock work.>
Also, any advice on what to stock/not stock in the "in tank" fuge would be greatly appreciated.
<Read here and linked files above.   http://www.wetwebmedia.com/refugium.htm
You may also want to read "Refugiums 101", which is shown on the link you sent us.>
Thanks
<You're welcome.  James (Salty Dog)>

Small system - carbon, HOB fuge, and quarantine   8/24/06
Hi WWM team,
<Jeff>
Thanks for all your hard work. I've had a 29 gallon system running for about 8 months: AquaC Remora, vigorous water movement owing to two powerheads, 35+ lbs of live rock, and less than half an inch of CaribSea substrate (1mm). The tank is currently stocked with a single small mushroom, owing to a move I've long anticipated. (This is still a pretty interesting tank in its own right, as the various macroalgae have flourished absent predation.) I'm about ready to begin stocking this tank in earnest, but know I need to address at least two deficiencies first:
1. I'm not using activated carbon (having opted temporarily for frequent water changes given the low bioload).
<Can use/add or not...>
2. I have no media in my tank ready to transfer to a quarantine tank for biological filtration.
<Mmm, yes you do... you mentioned some substrate and macroalgae>
I don't strictly consider the lack of mechanical filtration to be a problem, but perhaps it will be when I increase the tank's load.
<Might>
Now my questions: I've been eyeing some of the HOB refugiums lately and was hoping I might be able to place both activated carbon and sponge (for the quarantine tank) in such a fuge. Would this generate enough water flow through the carbon to achieve a reasonable level of chemical filtration?
<Yes>
Would sufficient bacterial colonies grow on the sponge?
<Yes>
Or am I better served by a power filter with activated carbon and filter media?
<Nope>
Of course, I could try both, but real estate is a little scarce.
<Not here in S. California... and the price, along with the U.S. economy, will be dropping rapidly and soon>
Also, how important is water movement in a quarantine tank?
<Can be...>
From some of Calfo's posts my sense is that a sponge filter will suffice, but Steven Pro's RK article (2004) suggests one may want additional water movement.
Thanks. -Jeff
<Need to have some of both. Bob Fenner>

Water Flow Through Hang-On Refugium 06/09/06
Well I've read through lots of threads on this wonderful site and have come close to finding the answer I need but not quite.  So I am forced to bother you with yet another question.
<<No worries mate...ask away>>
I have a CPR 24" hang-on fuge with the small pump it came with.  This fuge has a couple 2 or 3 baffles that keep water flow going slow through the fuge.
<<Mmm, not really slow...but more diffused>>
I am battling major Cyano in there while trying to rear Chaetomorpha (sp?)
<<Chaetomorpha>>
I've read on wetwebmedia.com to simply increase the water flow.
<<Sometimes helps, yes...possible detritus accumulation>>
But I have heard from a knowledgeable fella at my local fish store who has a successful reef of his own that because of the baffling setup in these 'fuges, even with upgrading to faster flow, she still goes through slowly.
<<I don't totally agree.  The baffles will diffuse the flow, but they won't "restrict" the flow any more than if you were flowing the water through a pipe/round hole with the same void space.  As long as you don't exceed the “total volume" of water the baffles can handle/process, you can likely implement an increase.  Be sure to test carefully/maybe install a valve to temper flow if you install a larger/more powerful pump>>
In order to rid the Cyano, we need more flow.  Shall I break off the baffles or will a larger pump actually do the trick?
<<I'd try the larger pump>>
Seems to me, logically, unless you have a powerhead blowing at something directly, you won't get proper water flow strong enough to actually "blow" the nuisance algae off surfaces.
<<In the small hang-on device you describe...likely true.  So why not add a powerhead to the refugium chamber?>>
What are your thoughts?
<<As stated>>
Thanks for the clarification,
Jason
<<Hope it is useful.  EricR>>

Hang on Refugium worth while?  3/7/06
I'm so confused.  I have a 75gal reef tank w/Fluval Canister running bio-ceramic noodle, phos-remover & carbon.
<<I am not so much a fan of canisters on reef tanks.  See here: http://www.wetwebmedia.com/ca/volume_2/cav2i5/Filtration/Filtration.htm>>
I want to add a fuge, but am nervous about building one-baffled by baffles!! Many people on the boards say that a hang-on fuge will do very little.  I basically want it as a bio-filter (no mechanical-I can put that in my FLUVAL), as a place for macro-algae to lower nitrates & as a food source for my coral and fish.
<<In my opinion, some fuge is better than no fuge.  However, you may also see significant denitrification by simply removing the canister filter.  Also consider that by removing particulate, your canister will filter out the very food items you are trying to add with a fuge.>>
Is a 3 gal hang-on worth it or should I dive in and build a 30gal sump/fuge??   I live in NYC so am limited in space-and a tank overflow would be disastrous in my pre-war apt building.  Also-a fuge underneath the tank is an invitation for my kids---would hate to find a magic marker or Playdough in there one day!!
<<Floods and kids can do just as much damage regardless of a sump (especially with a HO fuge).  Good engineering and child-proofing are key.  Well designed drains and careful maintenance will help prevent floods and locked cabinets will keep kids out.  That said...  A HO unit may help you sleep better at night!  As for the baffles, I probably wouldn't even use any.  Use a very small powerhead to pump water from the fuge to the tank and a "J" tube to siphon water from the tank to the fuge. That way, if the siphon breaks, the fuge volume pumps into the display (no flood) rather than the other way around (big flood!).  Small RIO and Mini-Jet brand powerheads have excellent inlet screens to prevent sucking up living critters and work well for this purpose.>>
What to do what to do!!  I spend more time obsessing about equipment than coral!  Help!  Brant
<<You didn't mention a skimmer.  If you don't have one, I would trade the canister for a good HO skimmer (I am a fan of the CPR remora pro) before adding a fuge.  Your water quality will improve and your nitrates will fall.  Best Regards.  AdamC.>

CPR Aquafuge and  red Algae  - 01/23/2006
  I have a 50 gallon SW tank set up for about a year and I've always had some kind of Algae in my tank I do water test and they seem ok  NO3 is 10 and PO4 is 00.3 to 0.1  My wife is always wanting to remove the rocks and scrub them clean. but that is problem doing that isn't it ?  
<Only stop-gap... but I would do it>
I am looking in to getting a CPR Aquafuge Hang-On Refugium. and putting some live sand and rock rubble and Chaetomorpha Chaeto Macro Algae to aid in phosphate and nitrate absorption.
<A good/worthwhile addition>
I would like to get the 25" but my tank is 36" so I'm going with the 19"  to give me some room on the back of my tank
  I have this red Algae that is loose and like a sheet in small patches. is it Algae or something else. it's not all red some small hair and some green and brown.
<Is likely a Blue-Green... Cyanobacteria... little doubt, slimy to the touch>      
        50 gallon tank                                                              1 tomato clown
        50 lbs of  fine sand not beach fine sand                          1 6 line wrasse
        50/60 lbs live rock                                                         1 diamond watch goby
        CPRs Bak-Pak 2R protein skimmer                                 1 yellow tang
       2 Maxi-Jet powerheads 1200                                       1 brittle star                                     
       Fluval 404 canister filter                                                  ? hermit crabs
      18 watt Emperor Aquatics UV sterilization                and a thriving bunch of  button polyps that came as hitchhikers
      130 watts power compact of light                                that are reproducing     
   <I encourage you to go ahead with your plans. Bob Fenner>

Hang on Refugiums  12/12/05
Hello again.
<I'm here again.>
  With Adam J's advice I have been looking at the
AquaFuge Hang-On Refugium 18, is this the right size
for my 55 gal tank or would you recommend a different size or brand?
<Great brand, they do make different sizes though, all I can say on that is, "The bigger the better.">
What kind of equipment would I need with it?
<I believe it comes with all the necessary equipment except lighting, most folks I know who use it go with a PC fixture. Like a 32 watt strip should cover the 18" area.>
The one I'm looking at online is  $99 but no
light is included. What would I put in the refugium (live sand, etc.?)
<I would either put some Miracle Mud in it or a Deep Sand bed along with a pound or two of live rock rubble. For macroalgae I prefer Chaetomorpha.>
Would I run my Prizm skimmer and emperor filter with it as well?
<Yes that's fine, but once the refugium is established I would remove the bio-wheel from your emperor.>
Also no local Petco or PetSmart Stores  have these items what would you recommend?
<I would order online, I trust Marine Depot.>
Thank you in advance for your help.
<Welcome, Adam J.>

CPR Aquafuge HOB - too heavy??? 11/3/05
Hello crew,
<Anthony>
I have a 60g acrylic tank and was wondering if it could support the medium CPR AquaFuge (19x4x12 approx 3.5 gal.) My tank is 48" long and 18" tall so the fuge would cover a third of the back. You advised someone with a 120g glass tank to be concerned. Should I be?  I can get the smaller size. Or is my acrylic tank stronger.
Thanks, Anthony
<I do think you'll be fine here... is likely forty some pounds total weight, but acrylic is tough, and the support is spread out... If you have further concerns you might contact the folks at http://www.cprusa.com/  re. Bob Fenner> 

Replacing Emperor 400 with Large AquaFuge Hang On  10/20/05
Hi Crew,
    I know this is going to sound like a no brainer when I ask this but I always like to get a second opinion from the experts. I have an Emperor 400 and an AquaC Remora Skimmer on my 55g tank. I was considering replacing the Emperor with a Large AquaFuge HOB. I know of the great benefits of having a refugium. I am doing this because the Cyano is driving me to my wits end. The strange thing is despite the recent purchase of an RO unit and carefully monitoring of feeding as well as 5 gal weekly water changes. It has only been slowed slightly.
<Takes time... the Cyano insidiously/cleverly modifies its environment to favor itself...>
The only thing I can think of is a more aggressive method of nutrient reduction. All parameters test fine: Amm. 0, Nitrite 0, Nitrate 0, pH 8.3 and SG 1.24. I do not have a phosphate test kit but just from what I am doing I figure they are fairly low as well. An just on last thing, anyone with experience with this unit please tell me how long the input and return pipes are so that I can be sure it will fit my aquarium,
<See CPR-USA's site re...>
because I have a wooden frame around it. Oh yeah, are there any opinions on the AquaFuge as far as performance and any reported problems.    
                                           Thanks,
                                                    Mike
<See WWM, the various BB's for input here. Bob Fenner>

CPR Aquafuge 8/17/05
Kind Crew, <James here>
I'm in the process of looking into purchasing the Aquafuge 24 for my 75
gallon. My current filtration consists of a Remora hang-on, three Maxi jet
1200's, and a old Penguin 160, mostly for charcoal, (no sump), about 80lbs
of live rock, including the 30lbs below and a 3" sand bed, south down about
2 years old. I'm looking to replace the Penguin with the Aquafuge and have
a passive sack of black diamond charcoal in the inlet side of the AquaFuge.
I just recently purchased 30 lbs of Gulf-view rock and 10 lbs of their live
sand. After curing I put about 20lbs in the display and in a separate tank
I still have the 10 lbs of live sand mixed with some south down and about
10lbs of the live rock. My questions are concerning the Aquafuge. Is it
possible/or a good idea to provide the charcoal in the first chamber? <I think I'd let the AquaFuge process the waste to start with.  Put a few pieces of live rock along with some Caulerpa in the fuge.  You will want a light over the fuge.> I'm
not sure about the weight in the AquaFuge being supported on the tank, but
can i get away with about 30 lbs? <I'd contact CPR to be on the safe side, but I'm sure it is more than capable of having a sand bed with live rock rubble.> A 3 inch sand bed along with the 10lbs of rock, possible more rubble from LPS added at a later date. The tank is
FOWLR with the possibility of adding a few corals in the future one the
Aquafuge is established. Any help would be appreciated. <If you go this route, keep me posted as to your success.  James (Salty Dog)>
Thanks, Dave

CPR refugium light 07/01/05
Bob [or assisting minion]:
<Mmm, just the common progenitor minion>
I saw the post from the fellow who was asking about lighting for a CPR refugium.
The company offers lights for each size of fuge, and they are available by order through any CPR dealer [which can be identified on their website].  There are, in fact, two distinctly different mounting feet available--one set is arched, and fits on the width end of the fuge, while the other is comprised of acrylic brackets that go across the fuge top. One's choice can be dictated by the dimensions of the canopy, wall clearance, and so on.  I have successfully ordered one for my wife's 38gal, which has the medium sized unit hanging on the back, and am waiting for another one for mine.  The price is generally in the seventy dollar area.  Nice housing, nice fixture, internal ballast--overall, a very satisfactory product.
Best regards,
Rick
<Thank you for this Rick... The owner of CPR, Suk Kim, is a very thorough, conscientious manufacturer... and a friend. He would not leave off having all the components needed for his products. Bob Fenner>

Refugium Question - 06/03/05
Ok I recently bought a large CPR refugium.  I currently have a DSB in it with Chaeto growing in it.
<<Super!>>
My main and on going problem is the issue with Cyano I cant manage to get rid of it and since the water flowing through the refuge is so little it seems to grow like a wildfire in there.
<<Solution is simple...step up the flow.  Chaetomorpha algae is appreciative of high water flow...Cyanobacteria is not.>>
I have a 75 gallon system very lightly stocked with fish heavy LPS and soft corals. ETSS Reef Devil and all my other specs are in line as to where they should be.
<<OK>>
I only feed maybe 3 times a week and my fish scarf everything up.
<<I would feed more often than this...at least daily.>>
I have tons of flow going through my tank but I still can't manage to kick the Cyano.
<<But you stated the flow through your refugium was little.>>
And the Cyano in my refuge seems to keep killing chunks of my Chaeto.
<<Yes...large/heavy amounts will cover/smother.>>
I use RO/DI water and I will be changing the filters on it soon.  But how can I get rid of the Cyano in my refuge.
<<As already stated.>>
Some ppl have told me that this is where you want Cyano but I don't want any at all.
<<A small patch or two is no real problem.>>
Main question over all is how do I get rid of the Cyano in my refugium because it is disgusting and it keeps killing my Cyano?
<<Kick up the that flow through your 'fuge.>>
Thanks hope I was clear.
<<Clear enough, yes.>>
Stephen
<<Eric R.>>

Refugium Lighting - 06/12/05
Greetings all.  Am adding the medium (19 inch) and large (24) CPR hang on refugiums with Chaetomorpha to two of my tanks.  Would 40 watts of PC be enough light for the medium, and 65 watts for the large?  Thank you. Rob
<<Hi Rob!  Others will argue differently...but I use two 65w PCs over my 55g Chaetomorpha refugium and my algae grows like crazy.  I think your lighting scheme will be just fine.  Regards, Eric R.>>

Hang-On-The-Back Refugium
Thanks Scott.
<You're quite welcome!>
Will go with medium Aquafuge so all
three filters fit on the back of the tank.  Sorry, I
meant changing the Rio on the refugium for a Maxijet;
already changed the Rio on the Remora after it ceased
to work, after a month.  
<Ahh...I understand. If you have any concerns as to the reliability of apiece of equipment, then it certainly makes sense to start out with one that you have confidence in!>
Incidentally, the damsel is one of the most timid (relatively) of the species that I have kept; it is usually found alongside the blenny.
<Ahh...good to hear. Fish, like people, are unique individuals, and it's hard to generalize, but you will get the odd fish now and again that does not conform to our expectations of them!>
May try a clown or two spot goby.  
<Fun, colorful fish that you will definitely enjoy!>
Thanks again for
your help. Elvis
<My pleasure! Glad to be of assistance! Regards, Scott F.>

Lighting for a CPR hang-on fuge 29 Jun 2005
Hi.  I am considering a 20 inch CPR hang on refugium
and am having trouble finding an appropriately sized
light strip.  
<Mmm, there are plenty about... See the fish mag.s, the Net...>
Would 28 watts of pc suffice for growing
Chaetomorpha and either Gracilaria or Ulva, or should
I go with 40?
Joe
<I would use the smaller wattage of these. Bob Fenner>

AquaClear Fuge input
What do you recommend for the AquaClear fuge. I have a sand sifting star  
and a couple of cerith snails which I find sifting the through it. I also
have about 30 dwarf leg hermits, 5 scarlet reef crabs, about 6 Mexican
Turbos, 10 astrea, and 6 margaritas. What kind of stuff can I put in the
refugium to minimize phosphates and algae problems on the glass.<I would just put Caulerpa in the ref.  You don't want anything in there to gobble up the pods before they have a chance to multiply and provide a natural food source for the animals in the main tank.> I also read
something from WetWebMedia's site about soft corals helping with ich since
they filter out particles such as phytoplankton.<True, but they will never filter out all of it.> I don't know if this is true? How would I go about vacuuming my substrate because it is so fine? <Another crew member and I had a discussion about this.  It can be done with a long gravel vac.  Get the longest one you can find and try it.  You may have to keep trimming the vac part of it till you reach a happy medium.  As you know if it is too short it will suck the sand up.  James (Salty Dog)>
thanks
Joe

Confugion
After thinking about what you said in the email about the AquaClear fuge <This is the 110 power filter, correct?> not being effective enough I have am debating whether I should send it back and get a CPR AquaFuge.<The choice is yours but I would certainly opt for one of those rather than use a power filter for a fuge.> I was looking at the biggest possible which is the 25"
one. would this fit on a 55 tank since it has the center brace? Would this
be better than the AquaClear and worth the extra money (AquaClear-$35.99
CPR-$114.99). If it wouldn't fit I would get the 18" version. I have no idea
what I should do because it will cost money to ship it back and more money
for a new refugium. Aahhhhhh help me out! <The CPR sizes are 13, 19 and 24" long.  You will have to measure your area.  For the 80.00 difference I would go with the CPR.  It also serves as a very nice bio filter as well.  You will need to buy (if you don't have) a small PC hood for the fuge since lighting should be on 24/7. This will run you another 30.00.  The choice is yours Joe.  I personally don't see the power filter working very well as a fuge since you will have to put a fine pad at the bottom to prevent the sand from getting out, and along with the sand in there, I don't think the water flow through this will be enough for that 428gph pump on this filter. James (Salty Dog)>
thanks
Joe

Aquaclear 110 for fuge
http://www.californiareefs.com/tank7reef.htm
That's the site were I found out about the AquaClear. The baffle is made from
a piece of Plexiglas. I have also talked to the creator of the site and he
said to shave off some of the impeller fins or buy a impeller for a smaller
model to reduce the flow. Still what do you think I should do? <Joe, I thought this was a done deal.  You mentioned in your last email you were moving the tank to accommodate the CPR fuge.  If not, then I would go with the info California Reefs is giving you.  Obviously this guy built one and it works.  James (Salty Dog)>

Refugium
Well I successfully moved the tank and I returned the filter to PetSmart and
made money from it haha. Well I'm definitely looking into the CPR Aquafuge or
just making one myself. Do you have any tips on make one myself or would it
be better to spend 120 dollars on it. <Do a post on the WetWeb Chat Forum.  I recall a few people making their own.  There is a heading for just refugiums.  I think by the time you buy the acrylic, cement, something to cut it with etc, I think the $120.00 is well spent.>
PS- I hope you aren't getting mad that I keep bothering you about this. <No, that's what we are here for. Good luck with the refugium.  James (Salty Dog)>
Thanks,
Joe

Dazed and Confused re Refugiums
Hi,
My kids recently bought me an Aquafuge 25" refugium with a 24" 36 watt 50/50 Aqualight. I have diligently reviewed the
FAQ's (much to the chagrin of my wife) and since my primary goals for the fuge are nutrient export and fauna production purchased some Chaetomorpha.. I put about 2 inches of live sand in the bottom and added 4 pieces of live rock ( golf ball sized ). 
<Sounds good!>
The Aquafuge is baffled to eliminate disturbance of the substrate. I straddled my softball sized clump of Chaeto over the baffle near the inflow figuring that since the live rock would probably benefit from light, I needed a way to keep the Chaeto from overtaking the entire fuge.
<Periodic harvest>
Since the Chaeto sits near the inflow. I reasoned that water would have to flow through it rather then around it. My questions are:
With the Chaeto straddling the baffle I get no movement of the algae.  Will this hinder the Chaeto and collect detritus?
<Not much>
How much live rock should I keep in the fuge for maximal pod buildup?
<Mmm, about a third the volume maximally... shape and composition as important... want "holey" and carbonate based...>
Is it important for the live rock to get light?
<Mmm, generally yes... but ideally... this may seem confusing... best for some to be illuminated other amounts not>
When I move the Chaeto to harvest some, small particles of dead algae and other detritus are released into the fuge. Is this a problem (reintroduction of nutrients) or is this to be expected?
<Not a big deal>
Should I "clean" the Chaeto occasionally by squeezing or turning it?
<Can>
Thanks very much for your help. I think your site is amazing and have turned three other aquarists onto it. I also will be purchasing some of your authors' books.
<Thank you for your kind words... I do wish (as in "if wishes were fishes we'd all have full tanks") that I had even more time to devote, dedicate towards "completing" (Ha!) more of the content here... we are in absolute dire need of more articles, photos, graphics, even people to readily respond to folks' queries... Bob Fenner> 

Refugiums, and Stocking a Reef Tank
Hello-
Sorry to bother you again! I decided that I want a refugium for my 55 gallon tank, and was wondering if the large Aquafuge external HOT refugium would be enough to filter my whole reef tank, or do you recommend the use of a
sump/refugium?
<Either work fine... you may want more mechanical filtration>
If I used the hang on tank refugium how often, and how much would I need to do water changes, keeping in mind that I want to do few water changes a month?
<About the same... see WWM re>
Also I was wondering if I would be able to keep 1 percula clown, 1 mandarin goby, 1 firefish, and 5 green Chromis in this tank setup?
<Should be fine>
If not how many fish could I keep? If so could I also keep a hippo tang in there too, Keeping in mind I want to do as little water changes as possible. Thanks so much for your help, I greatly appreciate all the help.
Will
<I would study, set your mind on about what this system is going to take in the way of your time, before committing to the hobby. Bob Fenner>  

Refugium
Hello, <How goes it?> just a quick question on the refuge I recently installed on my 72G bowfront. It's one of those small CPR hang on type refugium units w/ compact lighting.. I have about 4 inches of fine sand and a small piece of liverock on the bottom. I have some red Gracilaria and a few dozen pods or so in now. I have had it on my tank for about 3-4 weeks now, and have just recently started to see red slime algae building up on the insides of the
refuge. I don't have this in my main tank now. What would be the normal cause of this in my refuge? Possibly not enough water movement? The refuge comes with a very small RIO pump, something like a 2, 3, or 400- cant recall what size. The refuge looks like there's no water flow through it, although the pump is doing it's job, and the water is re-entering my main tank fine. Any ideas? Thanks in advance.  <Heavy water flow isn't necessary in a refugium, so that shouldn't be the problem.  What is the light cycle on your refugium?  Are you keeping it lit 24 hours?  If so, the light + excess dissolved organics could be allowing the red slime to grow more readily.  Let me know your water parameters, light cycles, and filtration\skimmer info and I'll try to give you a better answer>
p.s. Have you guy's fixed your system not being able to receive pics yet?  I still can't submit pics.  
<Not sure I'll have to ask Bob.  M. Maddox> <<Some are coming through... don't know what's the dealie-oh. Bob F.>>

- Hang-on Refugium -
hey I got a question for you guys I have a 65 gallon reef tank I was wondering do you recommend a hang on refugium for my tank if so what is the decent size for this please help thanks
<I am only aware of the CPR hang-on refugiums, and I would recommend you use the largest one that will fit on your tank, leaving room for whatever else you have hanging on.
Cheers, J -- >

Hang On Refugium
In addition to my earlier questions, thanks by the way,
<You've got MikeD this time>
would a 5 gal hang on the back refugium be too much weight for a 120 gal reef ready all glass aquarium to hold?<I'd be very leery of it myself. While it MAY support the weight initially, long term stress and occasional minor impact of any kind is a potential for disaster on a major scale.>

Refugium problems
Dear WWM crew, about three weeks ago I after a Cyano problem I decided to add
a CPR AquaFuge to my 55 gal mostly softy, reef. In the fuge I put about 2"
CaribSea Aragalive sand, a couple small pieces of  live rock from my tank, and a
couple handfuls of Chaeto macro algae. Since adding this my leather corals are
closed more than open & they have shrunk in size.
<Possibly nutrient issues related to the addition of the uncured sand...what are your ammonia/nitrite levels?>
Before ,everything was
doing great with super polyp extension and good color. The refugium went from a
white stingy mucus inside to now a brown algae ( diatoms( & the sand bed is
covered with dirt & debris. It seems to be working correctly as far as flow goes.
Today I pulled the inside output tube off and threw in a couple snails. Oh yea,
there is also a film now on the surface of my main tank that never has been
there before. My question is all this a cycle, break in problem & will it clear
up and how long before.
<That's my best guess.  Should clear up fairly soon...are you skimming, running activated carbon, or any other chemical filter media?>
I am about ready to pull this problem off my tank
before more problems begin in my main tank, but have heard many good benefits
about refugiums, & would some day like to add a mandarin. Should I wait it out or
what???
<A 55 is a bit small for a mandarin, even with a refugium, but it will definitely help.  It shouldn't be added in the first year your tank is set up, in any case.>
<The initial Cyanobacteria you experienced thrive off of dissolved organics in the water.  Best way to get rid of them is to limit the nutrients available--don't overfeed, use RO/DI water for top off and water changes, skim, use activated carbon, and manually remove as much Cyano and detritus as you can with airline tubing.  With dedication it will go away, I promise.>

-Refugium & Macroalgae question-
Hi, Larry here. <Hello, Kevin here> I have a 120g FOWLR tank with a remora pro skimmer and 2 BioWheel 400 filters and power heads for extra water flow.  I have about 40lbs of live rock as well.  I just purchased a CPR 19" AquaFuge which hangs on the back of the tank to help with nutrient export and help keep my nitrates down which are running around 30ppm. <Remove the bio-wheels, problem solved!> My goal is to lower the nitrates to 15-20ppm. <Why not to undetectable?>  My fish are all healthy and I am not feeding too much.  The tank is stocked with a blue tang, purple tang, flag fin angel, false eye puffer,
Heniochus, tomato clown and a cleaner goby so I don't think its over stocked.  My nitrites and ammonia are always 0.
My questions are what type of media do you recommend for the refuge- live DSB or mud and what type of macro algae are most efficient at using up the nitrates? <My preference has been to use a DSB, but mud 'fuges work well also. Chaetomorpha is my favorite macro as it is not nearly as much of a pain in the butt as Caulerpa is.> I know that adding more live rock to the tank would help but I don't plan on adding more than another 15-20lbs. Currently I change about 18g of water every 6 weeks and don't plan on changing more often because I have enough work to do maintaining a 75 reef tank.  My tank is 1 year old and all the fish have been doing well.  Thanks, Larry in Minnesota gearing up for the 4 month deep freeze. <Good luck1 -Kevin>

20 gal with a refugium?
I have a 20 gallon Nano reef tank with 40 lbs life sand and 35 lbs of live
rock. I am currently using an Eheim wet/dry filter. I am looking to get rid of
this unit and switch over to a hang on refugium. << Great idea. >> I am wondering if a fluidized
bed filter would also be a good choice or would this provide increased
nitrates as the wet/dry does? << I think the fluidized bed is unnecessary with the benefits of a refugium. >> If this would not be a good choice of additional
filtration, what might be? My tank is fairly heavily stocked with fish and several
corals.
<<  Blundell  >>

Refugium
I have a 20 gallon reef tank set up. I am going to add a refugium in hopes  
of getting rid of all  non natural filtration, aside from the  skimmer.  I am
wondering what kind of substrate, plants, rock, etc would be  best to
accomplish this. The refugium I purchased is a CPR hang on model.
Thank you for your assistance.
<Please read: http://www.wetwebmedia.com/refugium.htm
and the many Related FAQs files (linked, in blue, at top) and/or through the hundred or so pages of the recent Natural Marine Aquariums, Reef Invertebrates book by myself and Anthony Calfo re these valuable tools... There are many options, alternatives with their champions, rationale to consider here. Bob Fenner>

CPR Refugium set up
What a great web site!  I just read Bob's book and was ecstatic to find out he will answer questions! << I too am amazed. >>  
I am basically new to SW, had some sea horses and a dragonet 15 years ago, but so much is new now.  I have had Fancy Goldfish for years, do well with them as I don't overstock.
Even after reading much on the website I am still struggling with the "best" way to set up a new CPR Pro Refugium under my 72 gal bow front tank << Well, I'd put in on the back of the tank, add about 3 inches of crushed coral, a couple pieces of live rock, and add a clump of Caulerpa. Simple as that. >> (used to have Goldfish, moved them to 50 gal) that we are just setting up for SW, fish only at first with LR and LS (not sure exactly how to get good LS), << The best live sand can be found by asking a friend for a handful of sand from their tank. >> but would like to go to more advanced stuff as we learn.
Thanks!
Anne
<<  Blundell  >>

Ramblings on Refugia!
Big hellos to the Crew,
<Hey there! Scott F. with you today!>
One month ago I placed an Aquafuge on my nano, I put some LR, Chaetomorpha, macro, 4 inches of sand and some Xenia. My question is about the 4 inches of sand. I know it decreases water volume of the AquaFuge but I still have around 20% of refugium to tank volume. Do I need that much sand and will it help with decreasing nitrates?
<My opinion is that the sand at that depth will certainly assist with denitrification. I feel that just about any refugium setup will assist with nutrient export if it is set up and maintained appropriately.>
How long before the refugium is considered fully operational.
<Well, the sandbed is "operational" from the start; whether or not it is contributing in a meaningful way to nitrate reduction and nutrient export will become obvious over time...>
My sand is developing small dark spots that I can see through the sides of the refuge, what might that be?
<Could be areas of anaerobic activity- could simply be algae seen through the side of the 'fuge...>
I placed above the refuge an 24 watt/pc, I have it on a timer with my main tank lights, I've read in your articles to leave the refuge lights on 24/7 but it lights up my main tank and disturbs those inhabitants. If I don't leave it on 24/7, will that throw the balance off in the refuge.
<I've done it 24/7, and I've done it "reverse" of the display tank lighting...I think that either way is beneficial. A lot of people feel that there is no advantage to 24/7 lighting in the 'fuge, and they are probably right! I'd go for the "reverse daylight" photoperiod. The stray light will not be too much of a problem, IMO. If it is annoying your fish, perhaps you can block out the light that is straying from the refugium...>
Thanks for your help and your site.
<A pleasure! Regards, Scott F.>

More Refugium Ramblings!
Hi,
<Hello! Scott F. with you today!>
I have a question about using AMiracle Mud vs. live aragonite in my hang on CPR AquaFuge.  I currently have a 120g
FOWLR tank. I have about 40lbs of live rock and about 25lbs of grotto rock.  The tank is stocked with a Purple Tang, Regal Blue Tang, False Eye Puffer, Flagfin Angel, Tomato Clown and Cleaner Goby.
<A pretty sizeable population- even for a tank of this size...>
I plan on adding a Navarchus angel and possible a Long nose Butterfly.
<I'd pass on new additions at this point, especially fishes of this size...>
I am currently using a Remora Pro skimmer,  2 Penguin BioWheel 330 filters ( I have removed the BioWheels from one of the filters)  and a power head for water flow.  All the fish are healthy and have been alive for 1 yr..  I recently bought the CPR Aquafuge to help with my nitrates which are running about 30ppm, and to cultivate pods and macro algae. (my ammonia, nitrites and phosphorous levels are 0, I do monthly water changes and feed sparingly).
<Good to hear...Perhaps more frequent (like weekly, smaller) water changes will help reduce the nitrate level further...>
What substrate do you recommend for the Aquafuge to help best to lower the nitrates? (I have about 4 inches of live aragonite substrate in the main tank).  Would live sand be any better than the mud or live aragonite?
<I don't personally see any advantage of one over the other. "Miracle Mud" is rich in minerals, providing nutrients for the macroalgae that inhabit the "fuge". Their subsequent growth and regular harvest will contribute greatly to the nutrient export process..>
Do you think adding another skimmer would help with the nitrates or should a remove one of the last of the 2 remaining bio wheels?
<Multiple skimmers are cool...A great way to contribute to regular nutrient export, especially if you clean them regularly. I like the idea of ditching the BioWheels, myself...They could be counter-productive to your nitrate reduction efforts. Excellent nitrite removers, but potentially contributing nitrate to the system...>
Also, would you leave the lights on the AquaFuge 24/7 or 12hrs during the night?
<I've done both- I would go "reverse" of the main tank photoperiod.>
Thanks for the help,
Always learning and freezing my .... off in Minnesota!
Larry
<Glad to be here for you, Larry! Keep those tootsies toasty! Regards, Scott F>