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FAQs about Morays Eel Compatibility 3

Related FAQs: Moray Compatibility 1, Moray Compatibility 2, Moray Compatibility 4, & Moray Behavior, Moray Eels 1, Moray Eels 2, Moray Identification, Moray Selection, Moray Systems, Moray Feeding, Moray Disease, Moray Reproduction, Zebra Moray Eels, Snowflake Morays, Freshwater Moray Eels, Other Marine Eels,

Related Articles: Moray Eels Bite, But Are They Venomous? by Marco Lichtenberger, Moray Eels, Zebra Morays, Snowflake Morays, Ribbon Morays, The "Freshwater" Moray Eels, Freshwater Moray Eels by Marco Lichtenberger, Other Marine Eels,

Dwarf et. al Lionfishes? Other Scorpaeniforms? With other Moray species?
With Triggers, Puffers, Large Angels?
With Rabbitfishes?
With Anemones?
No sir, not something likely, not something likely.... Often real trouble
May get chewed on
May get poked, envenomized
Likely to get stung

EMERGENCY: Injured Coral Cat Shark    6/5/16
Hello Wet Web Crew-
<Gabe>
I have had a Coral Cat Shark and a Tesselata Moray eel
<Mmm... not compatible.>

in my tank together for years, and just tonight, the shark began having trouble swimming. It would end up laying upside down, and would have trouble righting itself. Upon closer inspection, the shark appears to have a puncture along its back... The same size as a moray tooth.
<...>
The two of them have coexisted peacefully, without a SINGLE issue for years, and I don't know what is going on now.
<I hate to key it, but inevitability>
Please respond ASAP, as I don't know how much longer the shark will last. I have isolated it from the eel for the time being, but I need help.
<Need to keep separated... and at this point hope>
Thanks-
Gabe Walsh
<Welcome. Bob Fenner>

Paralyzed Zebra Eel          4/7/15
Dear Wet Web Media,
It's okay if you'd like to publish my question but I'd really appreciate it if you could keep my name and e-mail confidential.
Thank you very much.
<Will do>
My friend has a Zebra Eel that was doing well up until four days ago. Now, he is lying upside down at the bottom of the tank paralyzed.
<Mmmm>
He has been unable to eat and his breathing has been labored. She has done water changes and said the water parameters are fine. The Ph level is 8. Unsure of what to do, she began treating the tank with Kanaplex last night.
<... For? I mean; what is it you hoped to accomplish by applying an antibiotic to the water here?>
The eel's tank mates consist of a Foxface,
<Oh! Likely poked by the Siganid>
anemones and corals.
<Or poisoned vis a vis an allelopathogenic "fight" twixt these Cnidarian groups>

Could the eel have been stung by the Foxface causing this condition?
<Yes>
Is there any way to help the eel and make him better?
<Only time, hope; and attention to maintaining optimized, stable water conditions... I suggest partial water changes (10-20 %) daily, the use of GAC, PolyFilter... Adding medicine/s won't help>
Any information you could provide would be greatly appreciated.
<Try the search tool on every page of WWM w/ the terms I've mentioned above>
Thank you so much,
<Welcome. Bob Fenner>

tesselata compatible with large Zebra?      2/20/15
Hello ,
<Steve>
Have an approx 34 in long and growing Zebra Moray eel in a 330 gal with a few large fish.. (in process of building taller tank, 60w x 36x 40 tall, approx. 400 gals with a ton of rock going in throughout)
<Neat>
Recently a similar size tesselata Eel was made available to me.
<Mmm; unpredictable compatibility wise... can be a terror>

This particular tesselata is in a tank with fish and does not bother them or the owner during feedings, water changes and tank cleanings.
<So far...>
Your opinion, would you consider the 2 eels compatible for this environment.?
<Am a big conservative this AM... the choice of course is up to you.
However, if you're at all risk-adverse, I'd keep this fish elsewhere>
Thank you for the feedback.
Steven Turk
<Oh! Do you know Chris Turk... of the fish foods business? Bob Fenner>

Moray eel compatibility     11/26/14
Hey WWM crew! Have messaged a fair bit in the past and you guys have always been helpful! Just wondering if you could help again on a few quick questions :)
Tank details;. 5ft bowfront Juwel vision tank - 120 gal (450 litres)
Current stocking list;. Blue throat triggerfish x1. Saddleback butterflyfish x1. Galaxy clarkii clownfish x2 . Skeletor moray eel x1 (Just recently acquired)
The Skeletor moray seemed quite active after putting him into the tank, so was wondering if this is normal?
<Is common behavior... looking for a way out>
Has been swimming around the tank and in between rocks but haven't had this with previous morays I have kept before so thought I had better ask :)
Now the next question would be about future stocking, as am looking to get these few fish below;. Regal angelfish (yellow bellied variant). Flame angelfish . Red tail tamarin wrasse. Blue ribbon moray eel
Would this be too much to add?
<Yes; particularly the last
. Rhinomuraena don't do well in captivity period; would highly likely perish here. Tamarin wrasses are not easy... neither most Regals>
are there any from the list above that you would add first?
<The Centropyge>
Am worried about the 2 morays though so thought I would ask, so do you think they could mix?
<Not>
if so how would you do it?
Thanks and best wishes!
<And you. I'd keep dreaming, reading at this point... look for other livestock, perhaps another system.
Bob Fenner>

Skeletor eel... Echidna xanthospilos. in/comp.      8/5/14
Hi,
<Frank; and have sent this to MarcoL for his separate response>
I was trying to find out some information on a Skeletor eel. I hear from the lfs (which is selling it for 250) that they usually get to the max size of 18-20 inches in the home aquarium from the experience of their clients.
<Agreed; usually smaller>
They also mentioned that they only get as thick as a thumb... The one they have is about 7" and is the size of a pen in thickness and i was told it will grow slow unless you feed very frequently.
<This is so>
I currently have a Hawaiian dwarf moray eel (based on my research they will be ok with each other)
<Mmm; well, even Dendrochirus (compared w/ larger Pteroines) can/will inhale other fishes, motile invertebrates... if they can>
and is a good little guy. I have a 54 gallon corner tank, but the rock work is designed with lots of overhangs and caves for the eels and a I have tight cover on the tank. Since it is a rare eel and I feel that this is a good price on him. I did a lot of research and so far the experience with this eel is that its a calm eel like my dwarf eel. I know eventually he will probably need a bigger tank, but if he grows slow, I can enjoy him before his next home. I do have two cleaner shrimps and a conch (the only inverts I care about)..... will they be ok with the eel?
<Not the shrimps eventually>
Also, I have a diversified community of fish including a pair of clowns, borbonius Anthias, Tailspot blenny, yasha goby, tanaka possum wrasse and a tiny marine Betta (1")
<You need more room; esp. for the last... And this Echidna may well consume your smaller fishes>
(i rather have a bunch of small sized fish in my tank). Will the Skeletor go after the Tailspot or yasha? Also, if I feed 2x a week (krill and silversides) will it grow slowly? Thank you
<Welcome. Bob Fenner>
Frank
Re: Skeletor eel
     /Marco      8/5/14
Hi,
<Hello Frank.>
I was trying to find out some information on a Skeletor eel.
<Echidna xanthospilos>
I hear from the lfs (which is selling it for 250) that they usually get to the max size of 18-20 inches in the home aquarium from the experience of their clients.
<20-24” is a typical maximum size for this species.>
They also mentioned that they only get as thick as a thumb...
<They must have quite fat fingers then. The adults look like this: http://fishdb.sinica.edu.tw/chi/spe_picture/dpi600/hmchen25.jpg>

The one they have is about 7" and is the size of a pen in thickness and I was told it will grow slow unless you feed very frequently.
<Can take them about 2-4 years to grow to their maximum sizes.>
I currently have a Hawaiian dwarf moray eel (based on my research they will be ok with each other)
<Can work, however, I’d prefer eel tank mates with similar maximum sizes.>
and is a good little guy. I have a 54 gallon corner tank, but the rock work is designed with lots of overhangs and caves for the eels and I have tight cover on the tank. Since it is a rare eel and I feel that this is a good price on him.
<Depends on where you are. They are half of that here in my part of Europe, but I’ve also seen them for much more.>
I did a lot of research and so far the experience with this eel is that it’s a calm eel like my dwarf eel. I know eventually he will probably need a bigger tank,
<Yep.>
but if he grows slow, I can enjoy him before his next home. I do have two cleaner shrimps and a conch (the only inverts I care about)..... will they be ok with the eel?
<Likely, though cleaner shrimps are not completely safe with an Echidna species.>
Also, I have a diversified community of fish including a pair of clowns, borbonius Anthias, Tailspot blenny, yasha goby, tanaka possum wrasse and a tiny marine Betta (1") (I rather have a bunch of small sized fish in my tank).
<Sounds like a crowded tank 54 gallon tank to me. I would not add another eel.>
Will the Skeletor go after the Tailspot or yasha?
<Unlikely, they are mostly crustacean eaters in nature, however, they are not 100% safe with small fishes when hungry.>
Also, if I feed 2x a week (krill and silversides) will it grow slowly?
<I do not recommend malnutrition in order to stunt fishes. Feed it properly and have a tank of sufficient size or don’t keep it. Krill and silversides make no healthy moray eel diet. Please see WWM re. This species is related to Echidna nebulosa (Snowflake eel) and Echidna polyzona and should be kept and fed in a similar way.>
Thank you Frank
<I hope the information is useful for your decision. Cheers, Marco.>
Re: Skeletor eel

Thank you for your prompt response
I will pass on this guy then.

Snowflake Eel acting weird. In w/ Lion, mis-fed, no rdg.     2/8/14
Hello,
<David>
I have a snowflake eel that I have had for a year now. She is roughly about 12 inches or so. She is housed in a 29 gal tank with my lion fish
<Not a good match compatibility wise>

 (working on new 75 gal tank as we speak), 2 snails and 2 hermit crabs.
<Lions have been known to swallow>

Tank has been healthy, regular water changes etc.
<What re water quality tests?>

Two days ago after feeding she vomited back up the pieces of silversides
<A poor choice in foods... READ what we have archived re their nutrition; Marco's article on Thiaminase....
http://www.wetwebmedia.com/lionfdgfaq2.htm
and the linked files above>
she had eaten (never done that before) and over the last week and a half or so she has re-arranged pretty much all of the sand in the tank and burrowed under all the rocks (she has always had her set rock cave hole).
Now she is not swimming around like normal, would not eat tonight, seems to be breathing a little fast and didn't seem to care that I moved around a couple of rocks. She is just kind of hanging out on the sand. Her color seems to be normal. I can not see any markings like she scratched herself on a rock or something. I read that these eels are pretty resistant to disease and lionfish stings.
<The former yes; no to the latter. Seen many Eels/Muraenids killed by such>

I know that they need a variety in diet, so I go back and forth between frozen silversides (which she loves), live ghost shrimp, frozen clams and live feeder fish.
<... dismal>

I just did a water & filter change tonight. I don't want to lose her. Any help would be great! Thanks in advance!
Jessica
<Keep reading. Bob Fenner>

Hawaiian Dragon Moray Eel Compatibility    1/17/14
Hello Wet Web Media Staff
<Andy; Mmm, Jake>
This is my first time sending an email to you, so I hope that I have sent this correctly.
Currently I have a 300 gallon fish only with live rock system which is soon to be inhabited by my 9inch Porcupine Pufferfish (he was being looked after by our local fish shop whilst we sold our old 100 gallon). My Porcupine Pufferfish will be housed with an almost one foot long convict goby we also had housed originally in our 100 gallon and a 5 inch Majestic Angelfish.
To add to this aquarium we are going to be adding a Hawaiian Dragon Moray Eel.
<I hope/trust this is a small specimen. The species is, make that IS a piscivore>
I have been spending a lot of time researching this Moray Eel and am set on purchasing one, but unfortunately also considered looking into purchasing a Green Moray Eel
<Gymnothorax castaneus? These two may not get along>
to live along side the dragon eel. My main question was; Do you think that a Hawaiian Dragon Moray Eel could live together with a  Green Moray Eel peacefully, or are they not compatible, considering the Green Morays size potential and nature?
<IF both were started together at 1.5' long or less, I'd give you 50:50 chance that they'd cohabitate... if larger... less/worse odds>
Thank you,
Jake
<Welcome. Bob Fenner>

eel bitten by angelfish       12/6/12
Hello crew,
<Hi Amber.>
Yesterday I received a Skeletor moray eel (Echidna xanthospilos). My Bicolor angelfish (Centropyge bicolor) basically destroyed it. She bit the flesh off of the eel.
<What an evil angel.>
He is alive but barely. I was wondering if there was anything I could do to save it?
<Depends on how severe the wounds are. I've seen morays with incredibly large, but healed wounds such as missing jaw parts, completely lost tail.>
Any kind of dip or medication to help nurse him back to health, or is he a lost cause.  They are both now in holding tanks until I figure out what to do. Please help me.
<The most important thing is to keep the water quality high. If you notice signs of bacterial infections of the wounds, you may have to use an antibiotic such as Maracyn II (will treat many gram negative infections).>
Amber
<Good luck to you and the eel. Marco>

Eel compatibility in 95 gallon fowlr    6/13/12
First off this is great site and I have learned so much but I have a question of my own. I currently have a 95 gallon tank that is 5ft long.
Currently it has a 5" lunar wrasse, 5" miniatus grouper, and a 11 " snowflake eel. In terms of filtration a cascade 1200 and 2 CPR bakpaks. My question is would it be reasonable to put another eel in this tank?
<I would not. Not because of incompatibility (a Zebra eel would likely be compatible), but because the tank in my opinion is already quite full, especially if the growth of the next two years is taken into account.>
I've been looking at zebras (i would be getting one smaller than 2') and chainlinks and both seem to have ups and down and many and have read many opinions. I know the big issue with the zebra is size but I will not have my tanks two years from now. So any thoughts? Thanks!
<Cheers, Marco.>
Re: Eel compatibility in 95 gallon fowlr – 06/14/12

Thanks for the advice and keep up the good work!-Rayan
<You are welcome. Marco.>

Eels, Moray comp.     4/24/12
Hello all.
<John>
I have a quick question for whoever gets this email. I have checked the site in every category I can think of that my answer would be in, and I'm coming up with half the answer or vagueness probably on my part.
<Every system is different which can make finding a definitive answer to your situation difficult.>
I have a 240 FOWLR, the only two inhabitants are a Snowflake Moray Eel and a Zebra Moray Eel. My question is, are there other Eels that would be able to coexist with them?
<Any of the Echidnas would be a safe bet.>

I'm really liking the Dragon Eels but from what I've read that might be the least likely to live with them.
<Aggressive piscivores are always a risk and ideally should be kept with similar mannered tankmates. If you want to add a Dragon, I would remove the Snowflake and either trade the Zebra for a larger one or remove it. >
Both of my eels are approximately 15-18 inches and would only get same sized tank mates.
<Need to factor in adult length and girth.>
 If my theory on the Dragon is right, would you please offer some suggestions on what others would work, I'm open to any ideas like chain link, white mouth etc.
<Pebble-tooths would be the safe play but one or two of the smaller less aggressive Gymnothorax may work. G. miliaris is an option I would look into.>
 Thank you so much for the time and again if the answer is on the site and I missed it, I apologize. Have a great day all.
<And a good day to you>
John
<Jordan>

my eeeels – 4/19/12
Hey!
<Logan>
I have a 49 Gallon marine tank with 30lb live rock, a few hermit crabs and several Mexican turbo snails that I got from our local beach (I know it was risky but found out my local beach is very similar to my tank!) Apart from the little guys I have (had) a Tomato Clown Fish who just died for no apparent reason.
<My money is on an eel attack.>
 He was about 3 inches long, and fully happy eating regularly. My water levels are perfect,
<This is hard to believe with two fully grown eels in a 49.>
 the only thing I can think of is I don't have an Anemone for him to host.
<Anemones are not necessary for a clowns health.>
 My real question however is for this. I have two fully grown Moray Eels, one is a regular snowflake, the other is a freshwater moray that I have converted to salt water.
<Echidna nebulosa and Gymnothorax tile? How did you come to the conclusion that they are fully grown? A fully grown E. nebulosa needs a larger tank.>
 The two seem to love each other perfectly, even sharing caves and food and runways! However, my freshwater moray (Squigels) is showing signs of bite marks. There are a few on his (or her) back, and one on the tip of her tail. I was wondering if they are starting to mate?
<They are fighting, tank is too small. The two will not mate.>
 or just now starting to fight. they have been living happily for over a year.
<E. nebulosas become quite aggressive as they mature; even more so if kept in cramped conditions.>
 My other question isn't so much of a problem, just a question. Both of my eels seem to be afraid of nothing, as they love to roam my tank during the day, staying out in completely visible areas.
<They are constantly roaming because the tank is too small/crowded. Provide a proper habitat and they will behave normally..>
One of them even has a runway which he goes around every day, so much that the sand in the area where he gets lower to the ground has banked a little bit.
<Again, tank is too small and this is a result.>
 I have only ever read these guys to be nocturnal skittish animals, however mine seem to be the exact opposite. One of them (Thunder fist) even likes being picked up slightly out of the water, and pet!
<Good way to get bit.>
 It gets sorta the same look in his eyes as my dog when I rub behind his ears. Is his type of behavior normal or am I an amazing eel trainer? or both ;)
<The E. nebulosa needs to be removed. If not one or both eels will perish.>
Thanks so much!
<Please capitalize "I", proper nouns, and the beginning of sentences in any future queries.>
Logan G.
<Jordan>

Moray, angler compatibility/ tank limitations   4/1/12
Hello Crew,
<Hi Amber, Jordan here.>
My name is Amber. I recently lost my Snowflake Eel (Echidna nebulosa), after setting up a new 55 gallon tank for him. He was lost due to a stupid mistake on my part and I should have known better. Lesson learned.
<???>
I replaced him with a Black Angler (Antennarius commersoni).
<Quite a bio-load for a 55.>

Though, soon after, I realized how much I missed having an eel. I can not seem to find something other than a Snowflake to fit into the tank.
<A 55 really limits your options but an Echidna catenata is another possibility. Peaceful enough that it should not attack the Angler and large enough to avoid being eaten.>
I was wondering if you had any ideas on what kind of Moray Eel will get along with the Angler, who is the only other inhabitant in the tank.
<The problem is that you have chosen an Angler which will get fairly large and able to eat most tank mates that are suitable for a 55. Other than Echidna catenata and Echidna nebulosa. most morays that will live out there life comfortably in a 55 will likely be eaten by the angler. If the Angler were to be removed I would recommend an Enchelycore carychoa or a pair of Gymnothorax melatremus.>
I have plenty of live rock and hiding places. Also, a 20 gallon sump, protein skimmer, and a very large filter.
<Consider adding a pvc network for cover.>
Any suggestions would be extremely helpful.
Thank You,
<Quite welcome>
Amber
<Jordan>

Golden Dwarf Moray Eel questions, stkg., sys., comp. 8/24/11
Hello! First of all, I love your site and everything that you guys do! I think it's wonderful that you are so helpful in this sometimes confusing hobby. I had a question that I was hoping you could help me with. I have always been fascinated by eels but it seems like most would do very badly in a tank my size - 20g (with a 15 gallon sump/fuge) - except I read in my Scott Michael's book about the "golden dwarf moray eel" (G. melatremus).
It says they only need 10g and that they are reef compatible except with crustaceans.
<Mmm, well... Scott is a friend and he and I's opinions match at least 98% of the time; but I find his "minimum system size" suggestions to be much smaller than mine; esp. for sharks and eel species>
I had a few quick questions about the species I was hoping you guys could help me with:
Would it attack or eat my Pearly Jawfish (Opistognathus aurifrons)?
<Quite possibly, yes>
I know these are "fish-eating" morays but that they are really small so it would be hard for them to eat other fish that aren't goby-sized. However, jawfish are relatively stationary rather than swimming all over the tank.
Would it eat my cleaner shrimp or harlequin shrimp?
<Definitely yes>
They are both at "full-grown" size but the book said they will eat crustaceans. Yet I did find a tank containing one and a cleaner shrimp?
Would my tank be large enough to house one?
<A small specimen perhaps... but just barely. If it were me, I'd look into other fish families than the Muraenids>
Is there anything else I should know about this fish?
<Can't tell from your statements>
Thank you! : -)
<Welcome! Bob Fenner>
Maggie

Eel with white coating on tail--what disease? 7/28/11
I have an eel (moray I guess).
<...>
See picture. I reduced the size so it may be hard to see the eel clearly, but his tail is still there, it's just coated in white slime? and he also has white dots higher up. The eel is still breathing
<... what other livestock is in with this fish?>
It's about 2 feet long and has been doing well for about a year. It is fed Formula 1 and 2 cubes and silversides, typically eating several cubes/fish every five days or so. It's always looked well fed.
Suddenly, in the past 24 hours or less, a strange white slime has started to cover the lower third of the eel. It is very sluggish sitting out in the open on the sand.
The same thing happened to another eel that was in the tank 6 months ago or so. That eel was dead within a day or so.
None of the other fish seem to be experiencing any problems. Water change was just done two days ago. Water parameters look good, my nitrates are generally a little high at 30-40 but this is FOWLR tank, 400 gallons so not overstocks even with 5 other big fish in it.
Has anyone heard of a disease that manifests itself with this white coating.
There are little spots also visible higher up the eel.
Any advice or does it look hopeless and I should get him out before the other fish starting picking at him. The other fish are red snapper, grouper, lion fish, blue tang, raccoon butterfly, Porkfish-all medium to large fish.
<I suspect the bass/grouper has picked on this fish... The Muraenid is likely doomed from the damage.
Bob Fenner>

re: Eel with white coating on tail--what disease? 7/28/11
Thanks Bob. You are correct the eel died and I removed it from the tank.
<Ahhh>
So you think the white slime is a physical condition or reaction to trauma from assaults?
<Indeed; almost assuredly... the "white dots" more proximal are little doubt from this Moray trying to escape its tormentor... dashing itself against rock>
The Red Snapper is huge, probably at least 12" and the Panther Grouper is not quite that large--both are aggressive and I have seen the Snapper fight with the eel over food.
<Yes... Chromileptis can "turn" abruptly>
I had another eel that died back in October 2010 that had exactly the same white slime on the body.
<Acknowledged. Saw your comment re previously>
That eel was 3' and this one was 2'. Could such large eels really be beat up that badly by a Snapper or Grouper?
<Yes; for sure. BobF>
re: Eel with white coating on tail--what disease? 7/29/11

Thanks Bob.
<Welcome Jeff>
While I have your attention, let me ask you whether you think any eels might be able to "handle" these tankmates?
<I don't think so. I would not try again>
Also, I'm surprised it is the grouper who is the culprit because by far the most aggressive acting fish in the tank is the big snapper. He routinely chases the grouper and the other fish away from food. He does seem to show a cautious respect for the Lion Fish however. LOL.
<Could be the Lutjanus sebae... is my "second guess">
I am sending a picture of it. He looks like an Emperor Red Snapper.
<Indeed>
The thing is I have had him since January 2010 and he was already quite large when I got him, so maybe six months or more old then. Outgrew former owner's tank. But he still has the distinctive markings of a juvenile. Is that possible given he must be at least 2 years old by now?
<Likely so>
Or have I misidentified the fish?
<Don't think so>
Sorry if I started a new thread.
<No worries. All useful information. Bob Fenner>

re: Eel with white coating on tail--what disease? 7/29/11
Very good, thanks for the assistance.
<Certainly welcome. BobF>

Fimbriated Moray Questions, sys., fdg., comp. 1/29/11
Hello again! Trevor here! =)
<Hi Trevor. Marco here.>
I'm happy to see this awesome site is still running, and still powered by the same awesome crew at WWM. I've searched through your articles and intend to fish for a little more information on Gymnothorax fimbriatus, but before I begin I'll throw out some information on the system he's in and what I intend to do in the future. The moray is ten inches in length and resides in a 40gal breeder aquarium. I'll eventually be placing him in a 125gal aquarium or maybe something a pinch larger than that.
<The latter sounds sufficient to me, if you wish you can go bigger.
Remember, they can reach 90 cm (about 3 feet).>
Currently, there's a 50gal filter running on his tank with a 100gal protein skimmer on it as well. The temperature is at 78 degrees F. Currently, he's eating silver sides and squid. I bought one because I felt they were the hardier of the marine fish I could get. I made this choice after having read an article about one that survived a fire at the pet store it was in.
Quoting the article the fish survived "-extreme heat, cracked tanks, toxic fumes, no power and even an extended dose of fresh water from the fire hoses." I have no intent to put that statement to the test but we do have occasional outages here caused by severe weather.
<Many moray eels are quite hardy compared to other marine pets. However, it also depends a lot on the technical and biological setup of a tank how long it can survive a power outage. Especially canister filters can be a problem. If organic matter and bacteria are trapped in there without any current (and consequently oxygen) for a day or even longer (will depend on the specific filter and how dirty it is) toxic ammonia, nitrites and hydrogen sulfides can develop and flood the tank when the power is back on again. So, during a long power outage it is a good idea to unplug and partly clean such closed filter systems. Tank size is also an important yet simple parameter: The larger the water volume and surface, the longer it will provide enough oxygen for the inhabitants. Battery powered air pumps are also a very good idea for a longer power outage. Temperature usually is no problem, but I know people who wrapped up their tanks in isolation material during a power outage in a hard winter (don't forget oxygen input in this case).>
I was wondering if sand eels were good for my moray, as I've seen them advertised on the web just recently as I don't go about looking for new food morsels very often. I plan to feed the moray well enough that it will hopefully live to be thirty years old, and even past that age with good water care included.
<Keep the food as varied as possible and add vitamins regularly. There's quite a number of fishes called sand eels from the family Ammodytidae used in trade, but I have no long term experience with the use of them as main staple. Given you add vitamins and also feed other things you should likely be fine, though.>
There are hermit crabs digging in the live sand as I type this along with a shrimp tugging the bristle worms out of the rocks that came with the live rock a friend of mine recently donated more of. I've considered buying snails to aid in the turnover of the sand and cleaning up after the Gymnothorax fimbriatus though I'm not sure if he'll attack them or not, however doubtful I am of that right now.
<Should not eat snails. Rarely you may see piscivorous moray eels carry snails out of their caves (happens as I write), but generally they don't harm them.>
I've been wrong before as you'll see with the fact that there used to be two of the shrimp and now I'm down to one in the month I've had this eel with no sign of the other. Perhaps he's hiding in the live rock but since I see the other one quite often I think that's a bit far fetched. Should I assume he'll consume the other shrimp as well or get more?
<Can't tell you for sure. Often they get along very well with Cleaner shrimps for years, sometimes they are eaten. Shrimps may also vanish due to other reasons than the eel or the eel may only eat dead or dying shrimps.
There are a lot of possibilities, even that some shrimp couples are apparently not long term compatible for whatever reason. In the 40 gallon tank I would only keep 1, in the larger tank you can try 4, but add them before the eel.>
Further venturing onto yet another aspect of what I plan to do with the tank, I've looked into introducing a Mangrove tree into the sand and live rock. Is it possible the roots could eventually crack the tank and would there be any way I could prevent this?
<By cutting the roots from time to time. I got about 7 year old mangrove bonsai in a tank, the roots should be cut about once a year.>
I've heard those trees are phenomenal in removing nitrates from the tank, almost to the point of replacing the protein skimmer entirely.
<Not likely that this is (only) due to the mangroves unless you got a whole lot of them. Macroalgae, live rock, water changes and possibly a sand bed (be careful with those power outages) can be much better for nitrate export. Don't expect much of one mangrove.>
The livestock of the tank are as follows-
Gymnothorax fimbriatus
Banded Coral Shrimp (x2?)
Scarlet Reef Hermit Crab x3
I've thought about adding bumblebee snails in as well for added cleaning.
It's said they'll eat even more of the bristle worms as well as carrion and detritus. The tree could help absorb a lot of that as well.
<No, it will only remove dissolved nutrients, not detritus.>
It all sounds like a good idea to me, especially with a larger tank although I was wondering how the eel would feel about all of this.
<The eel would not mind it.>
I understand he's supposed to get quite large, possibly up to thirty inches in length. One last thing I thought I'd mention as well, was that the customer service rep I talked to from liveaquaria.com said this moray would do well in brackish water as well as marine. While I haven't considered putting my Fimbriated Moray in the near future it seems like a good question before misinformation is spread though I really like the folks over at Liveaquaria as do my friends. I just thought I'd check things out with other people as well, preferably people who are much more experienced than myself. =)
<This species can actually occur in river mouths and estuaries, I guess that's where the idea comes from. But for long term care a marine environment is the only option. If you have too low salinity (SG<<1.018) for a longer time your eel might stop eating, it's immune system will decline. It probably would not reach the 30 years you are willing to keep it.>
Thanks! Trevor
<Welcome. Marco.>

White mouth moray eel
Zebra eel compatibility - 12/20/10

Hello again Marco :)
<Hi Callum.>
I will be purchasing my 5x2x2ft aquarium between January and June this year and would like to know if a White Mouth moray eel would be suitable for my aquarium.
<I'd consider this tank as the bare minimum for this species. Have you seen adults? They reach around 4 feet and get more than 3 times the girth of a Zebra eel. Examinations of their stomach contents in nature revealed they mostly eat fishes, so tank mates will be difficult.>
Is it aggressive and will put my zebra eel or my Sailfin tang in danger as I have heard it is semi aggressive so I didn't think this was to bad?
<Compared to other Gymnothorax species of this size, they are less aggressive, but still much more than a Zebra eel or Echidna species. I know a public aquarium who kept one with a Zebra moray for some time showing this is possible. However, if it was my tank I would not be willing to try this for the reasons given above and because this species when grown has the potential to eat both your Zebra eel and your tang.>
Thank you for your time.
<See earlier emails for recommended moray tank mates: Echidna species generally do well with larger fishes and Zebra eels. Commonly available are the Snowflake eel (E. nebulosa), Barred moray (E. polyzona) and Chainlink eel (E. catenata)). Also a good choice would be some small to medium Gymnothorax species, specifically Gymnothorax miliaris (Goldentail or Banana eel) and Gymnothorax thyrsoideus (White eyed moray).>
Callum Munro
<Cheers, Marco.>
Re: White mouth moray eel 12/22/10

Damn I just cant pick a suitable eel that wont turn into a monster LOL Just my luck :)
<You can always have a look here for quite many species:
http://www.wetwebmedia.com/morays.htm>
I think I will go with a Jewel moray eel or a Golden tail.
By the way are Skeletor eels <Echidna xanthospilos> rare and would that be suitable.
<Yes (but available) and yes (comparable to a Barred moray).>
Thank you for your help Marco and I will send pictures and updates
Callum Munro :)
<Cheers, Marco.>
Re: Moray Eel Compatibility
2/25/11
Thank you very much for your quick reply! I do have a few last question though (sorry). If I got a small moray, would I be able to keep a pair of engineer gobies too?
<If they are large enough, maybe. Personally I would not, because there is at least some competition for space and the gobies might try to occupy moray eel caves or block the entrances by their activity.>
I've been doing research on them and they seem like the most compatible sand-sifters for my tank but I do know that they need to live in pairs, so would I be overfilling the tank if I added them?
<Can be a very nice addition, but if you want them I'd erase the moray from the list. Much less trouble with compatibility in general for you going this route.>
Also likely what are the chances of a Chainlink or Snowflake moray eating the small fish I have,
<Somewhere between G. miliaris and the Zebra eel. Especially Snowflake eels can become problematic when apparently undergoing a natural gender change at a medium to larger size, which is accompanied by a change in dentition (to longer, serrated probable fish eater teeth). They can be peaceful for years and all of a sudden eat the other fishes. Most of the prey of these Echidna spp. are crabs, but fishes have been found inside their stomachs.>
since a Zebra Moray will probably get too big for my tank seeing as they can get up to 5 feet long.
<Most captive specimens I know reached between 3 (most of them) and 4 feet even in very large tanks.>
Thanks again for all your help! Alex
<Welcome, Marco.>

Japanese Dragon Eel and clown trigger. 9/14/10
Hi,
<Hello Kellvin.>
My fish store is bringing in a Japanese Dragon Eel for me. 25-30cm.
Currently I have a show Clown Triggerfish 25cm and a Banded eel and some grouper. Can the dragon eel be kept together?
<Nothing I would recommend.>
Lastly, can dragon eel tolerate Seachem Cupramine?
<Although it might not die instantly, no moray eel should be brought into contact with copper containing products of any sort.>
Thank you with God Bless. Kellvin.
<Cheers, Marco.>
Re: Japanese Dragon Eel and clown trigger.
Japanese Dragon Eel and clown trigger II, 09/15/10

Hi Marco,
<Hello Kelvin.>
Thank you for your quick respond. You mean that the Dragon eel will attack the groupers 15cm to 20cm and the trigger? Thank you very much.
<I rather see problems with the banded eel in the long run, which may/will get eaten as soon as the Dragon eel is able to. Groupers of adequate size are generally better tank mates for eels than triggers. They often
accompany eels in the wild, the two even hunt together. In addition, a Clown trigger of 25 cm can pose a severe threat to a young (25-30 cm) dragon eel. Therefore, I consider the fish community you asked about as not so ideal. This does not mean it won't work in every case, but implies that the chances are not too high. Consequently, I won't recommend it.>
Regards Kellvin
<Cheers, Marco.>
Re: Japanese Dragon Eel and clown trigger.
Hi Marco,
<Hello Kellvin.>
Oops I forgot to ask you, can I add my Clown Trigger of 25cm on my 300g tank consist of angelfish average size of 6-10 inches? Thank you.
<Please read here: http://www.wetwebmedia.com/clntrigart.htm. Younger Clown trigger can often be kept with various larger fishes, but once grown many if not most of them become rather aggressive towards their tank mates.
Bob put it this way: "almost always becomes something of a total terror with growth/age". Consider this when putting the trigger with other fishes.
>
Regards Kellvin
<Cheers, Marco.>

Echidna polyzona compatibility -- 05/18/2010
Hello everyone,
<Hi Randall.>
I've been in the hobby for about 5 years and I have more healthy/happy reef in my home than I do furniture.
I'll break down the set-up that I'm referring to in this e-mail.
This set-up consists of a 125 gallon reef and a 75 aggressive reef, both using the same 50 gallon sump. The 125 gallon reef has approx. 175 pounds of live rock, and a 40 gallon above tank refugium(should see the shelf), the 75 gallon has 75 lbs of live rock and a mini 5 gallon above tank refugium(on custom made acrylic canopy). Each refugium is completely full of macroalgae and neither are home to fish (only inverts). Water circulation is minimal in the refugiums, but supplemental water circulation is achieved with 2 Koralia 4's in the 125 and 1 Koralia 4 and 1 Koralia 3 in the 75.
Water quality is great, water changes aren't done as often as I'd like but I change around 150 gallons of this systems water around once every 1-2 months depending. Tank is bare bottom so detritus is removed as it collects on the bottom(small 5 gallon water changes). I have no issues with water quality, I use 0 TDS(Milwaukee TDS meter) RO/DI and mix in instant ocean. I supplement bio-cal and that is it.
Water is first skimmed by a very large octopus dual recirculating skimmer (this thing is massive and effective, almost could skim out salt with this thing) that I built a custom stand between the two tanks for. Then the water is ran thru silk screen(50 microns clog to fast and do not improve clarity enough in my opinion), and then filtered by 2 phosphate reactors always containing fresh GFO, and then 2 carbon reactors.
My 125 houses various coral species and inverts, a yellow tang, a blue hippo tang, 3 Perc clowns, and a mandarin. The 75 gallon is basically my Hawaii tank(I proposed to my wife behind the Hilton Hawaiian Village on one of our visits, so its our little peace of HI at home, VA), and is home to a Humuhumunukunukuapua'a trigger (I cannot call him anything else after seeing his relatives off the coast of Oahu), a Sailfin tang, and a snowflake eel(the 3 have been together for a year and a half). I understand that this home will not be suitable for the trigger and Sailfin forever, but they are small and I have other tanks for that :). My snowflake eel is probably 20 or so inches, this will be his forever home. I have a buddy who is breaking down his reef, and he has a Echidna polyzona (barred moray). I was curious to know if you thought that this home (75 gallon) would be suitable for both eels?
<Given high water quality I'd say that the tank is only suitable for the Snowflake eel alone long term. While it may work to keep them together, personally, I would not want to take the risk of bringing them together since the Snowflake eel has its established territory, which it might defend. Given the G. polyzona is only half the size of the E. nebulosa and given that smaller eels have been found in Snowflake eel stomachs in the past, the chances are not too bad this might end in a disaster.>
How would you introduce the second eel?
<If you still wish to try, keep both eels well fed. It would be best to remove the Snowflake eel from the tank, re-arrange the rocks and build new caves. Then, add the Barred moray, give it some time to settle in and then add the Snowflake. Closely watch the first meetings and feedings and be prepared to remove one eel if aggression becomes dangerous (broken jaws and such).>
The Echidna polyzona is around 10" or so. I'd like to bring him in but my set-ups are pretty solid and the inhabitants seem very happy, healthy and comfortable.
<Much worth in the world of marine aquariums. Keep it this way.>
I'll make my decision based solely on your opinion. Thank you so much for the help.
<If it was my decision, I'd not try it, because of the reasons noted above.>
Sorry to be so wordy. Thanks again to all of you for keeping this wonderful wealth of information and sharing it with the world. -Randall
<Welcome. Marco.>

Green moray; comp. 05/05/10
Hi
<Hello Alexander.>
I really don't know where to ask these question, so I hope you can help me here ?
<I hope so.>
I have a 2 feet Muraena pavonina (Brazilian dragon eel) in my tank in something around a year now.
But I really want to add a small green moray (Gymnothorax funebris), but I don't know how they get along together ?
<I don't think they will get along very well.>
I know they are both very aggressive eels.
< If the G. funebris is smaller than the M. pavonina, it can become food. I've seen M. pavonina swallow entire eels of almost the same length. However, even if you get a G. funebris of adequate size, this species will grow faster and much larger than M. pavonina. Consequently, at some point the G. funebris will become a threat to the M. pavonina. I would not recommend putting these two species together. Both regularly fail in combinations with other eels.>
The tank are something around 200Gal, and I have a public aquarium to take the green when it´s get to big. Sorry, my English is very bad, but am working on it :)
<It's well understandable.>
Best regards Alexander
<Cheers, Marco.>

Re: green moray
M. pavonina; comp. 05/07/10

Hi Marco.
<Hello Alexander.>
Okay, thanks :)
<Welcome.>
Do you know any other moray eel species, that can do well with my Muraena pavonina?
<People have made very different experiences with the compatibility of this species, it depends a lot on the specimen. I had success with a Southern ocellated moray (Gymnothorax ocellatus) of equal size. Many other tried combinations did not work long term (> about 3 years) with my M. pavonina specimens and the eels had to be separated. As a general recommendation I prefer to keep these eels alone (that's what I do mostly). Adding a second eel to a tank already inhabited by a M. pavonina does not make things easier. If you still want to try a combination and think that your M. pavonina is quite peaceful choose eels growing slightly larger than the M. pavonina. Also see http://www.wetwebmedia.com/moraycompfaqs.htm >
Best regards, Alexander
<Cheers, Marco.>

Re: green moray
G. favagineus and M. pavonina? rather not - 05/08/10

How about a small Gymnothorax favagineus?
<Won't stay small for long.>
I think it's a semi aggressive moray, and it gets to big to the M. pavonina to take down.
<Tried that while re-building an old tank. The M. pavonina recognized within seconds of addition of the G. favagineus, that there is a superior predator and left the tank with an incredible jump. Luckily I was still there and the jump ended right in my carp fishing net. Same problems as with G. funebris and M. pavonina, see last emails. When I look at a grown G. favagineus and a grown M. pavonina I have little doubt the dragon would become sushi.>
Best regards, Alexander
<Cheers, Marco.>

My snowflake eel is being attacked by my more eel.
Unknown eel incompatibility -- 03/24/10

My 2 eels have been living together for months in a 46 gallon bow flex tank. I bought the more eel
<No such eel. Do you mean moray eel? There are 200 species from a few inches to 4 metres. It'd have been good to know what species we are discussing. As a side note, the 46 gallon tank is too small for a Snowflake eel alone in the long run.>
after the snowflake and the more eel took over the snowflake eels cave. So I added another hiding spot, he always stays underground so I didn't think anything of it. Now the more eel is attacking the snow flake, he is biting his tail and body and even his head, he try's to pull him towards him or bring him in his cave. I'm so scared for the eel, I broke them up several times, but the more eel keeps going after him. The snow flake is oblivious and keeps getting attacked. I don't think he is going to make it much longer, help me please, what can I do. I feed them regularly. Please help asap.
<Separate them (don't get bitten) and find a new home for one or both (in separate tanks) of them. I'd ask the fish stores around and fellow hobbyists e.g. in forums if someone is willing to take one of them urgently. Also, try to ID the 'more' eel, start here http://www.wetwebmedia.com/morays.htm or send pictures for a proper ID. The possible wounds of the Snowflake eel should be monitored and the water kept as pristine as possible (nitrates <<25 ppm; no detectable nitrites or ammonia; pH between 8.0 and 8.4) to prevent infections. In case of a spreading infection, antibiotic treatment might be necessary. If the Snowflake eel survives and you decide to keep it, plan for a larger tank. Cheers, Marco.>

Re: My snowflake eel is being attacked by my more eel.
Unknown eel incompatibility -- 03/25/10

Thanks for getting back to me, I guess I will take a picture of him.
<I'm looking forward to it.>
He has a white round eye, a skinny long mouth that is always opened, his body is brown with some spots on it. He is about 12 inches long, his head is a darker brown and sometimes he has yellow spots. How is there memory, will the eel remember that he is aggressive towards the Snowflake or will he forget over time?
<Since they lived together for several months before the aggression started it is highly unlikely they will ever get along in anything smaller than a few thousand gallons. Their memory is quite good. But even if they would forget about the other eel, it is most probable the same behavior will start again under the same circumstances such as a relatively small tank for two eels. I'd keep them separated.>
Will adding more caves help and why does the Snowflake keep swimming by the other eel?
<No. This world is simply too small for both of them. Possibly the Snowflake eel is less territorial in this combination.>
Is he aggressive by nature or just dumb?
<The first, although it's likely rather territoriality than pure aggression what your moray eel is demonstrating.>
I appreciate your advice.
<They should be separated. Marco.>
Unknown eel incompatibility -- 03/26/10
That's a picture of my moray eel
<Thanks for sending. I fear it is too blurry to give an exact ID. Any chance for a better picture? There's a number of similar spotted Gymnothorax species, e.g. Gymnothorax prionodon from the Western Pacific, Gymnothorax phalarus from the Eastern Pacific and Gymnothorax johnsoni from the Western Indian Ocean, just to name a few. One would need a clear picture to be sure. Anyway, all the ones that might match your picture coming to my mind at this point get quite large (at least 3 feet, the G. prionodon and the G. johnsoni around 4 feet and a few inches) and are likely not compatible with an Echidna sp. such as you Snowflake eel.>
, the snowflake eel is being attacked by this guy, also can I buy dead squid from a local fish store and feed that to my fish.
<Sure, as long as it is not seasoned and free of preservatives aside vitamin C.>
Do I have to purchase fish from the pet store, or can I buy fish from the local fish store, and save money.
<I do buy almost all my moray eel food on the fish market or fish store. Just ensure there are no additions as written above.>
Sorry to keep asking for help.
<No problem.>
I'm just a fish lover and don't want to harm them. Thanks Craig.
<Take care Craig and for the sake of the eels consider having them in separate setups. Marco.>

Re Unknown eel incompatibility; now sys. -- 03/27/10
Hey so I'm looking for a bigger tank know, I'm hoping that will help my eel problem. I found a 125 gallon tank but the dimensions are 50 inches long and 60 inches high and 20 wide.
<Won't probably solve the problem of keeping the two together, but should be sufficient for one of your eels.>
I also found one that is longer and not as high and it is also 125 gallons. I want to add a sting ray and a banded shark. Is this a big enough tank?
<Certainly not for a ray and a shark. For the latter two you'd want to consider about 3 times the size or more. Please see http://www.wetwebmedia.com/sharks.htm and http://www.wetwebmedia.com/rays.htm . Also, their compatibility with moray eels is often rather poor in the long run.>
If not what size is the right one, I get confused with the right dimensions, should it be longer and not so high?
<Yes.>
Please help, and also what's a good filter can I use my filter for my 46 gallon and buy another filter to add to this one?
<I'd prefer a live rock filtered setup with a large skimmer and strong water movement. Please see here for marine filtration and setups: http://www.wetwebmedia.com/marine/setup/marsetupindex1.htm
Marco>

Unknown eel incompatibility -- 03/28/10
I sent you a clearer picture of my eel? Will he be a problem towards other fish as well, is he a violent vicious eel? Thanks
<Yes, looks like a young Gymnothorax johnsoni aka Whitespotted moray, although the head reminds me also of an undulated eel Gymnothorax undulatus, which has a different body coloration. Certainly a rare find. This eel is probably going be around 4 feet long when grown and likely is a threat to other fishes. The large grouper (hopefully this is not in a 46 gallon tank) might be compatible, though, if growing fast enough and offered sufficient space. Cheers, Marco.>

Eel ID -- 02/26/10
Hi crew of WWM,
<Hello Linda.>
I'm looking for help to ID my eel. Eel is approx. 30" and has VERY sharp teeth (I know this first hand..Ummm, well, Finger).
<Sorry to hear'¦ this is the most vicious eel species I know.>
I sort of think he looks like a Brazilian Dragon Eel but what is throwing me is the color. His spots are white and not yellow that I see in most all the photos I see of them.
<You are right with your ID. This is Muraena pavonina, often called Brazilian dragon eel a name that in the past was applied to other Muraena spp. at least in trade.>
I'm attaching photos as well as the photobucket links...I'm not sure which kind work better for you to view.
<Both work. Thanks.>
Thanks in advance for your time and assistance with ID'ing Eel.
<This species can undergo dramatic changes in color. Muraena pavonina typically has very large white spots. That's how they look mostly in nature and that's how they look freshly after import. They most often change this pattern to the pattern your eel shows within 6 months to 1 year. These smaller spots can be white or slightly yellow, also dependent of the lighting of the tank (/the camera/flash in the case of photographs). This happens regardless of the size (I've imported pencil sized ones and 2 feet specimens). The reasons are environmental, I believe it's an adaptation, but I cannot tell you yet if the critical parameters are physical, chemical or biological.>
Sincerely, Linda Close
<Kind regards, Marco.>
http://s112.photobucket.com/albums/n199/lclose5/Fish/?action=view&current=P2220062-1.jpg
http://s112.photobucket.com/albums/n199/lclose5/Fish/?action=view&current=P2220085-1-1.jpg

Re: Eel ID
Muraena pavonina; comp. -- 03/01/10

Eel lived with me for a few years and then I gave him to a friend who took one of my 180 tanks. She is now breaking down her tank and I am taking back Eel. I'm wanting to consolidate my tanks here and need to decided on who to keep and who to give away to other good/qualified fish keepers. I will have Eel in my 180 and have to choose a few tank mates for him.
Choices are: a good size/fat/healthy PBT 4-5"
an equally sized Sailfin 5"
smaller size Scopas 3"
smaller size Kole 3"
decent size YT 4-5"
rabbit fish 3-4".
<All about equally endangered or compatible with regard to the eel.>
All sorts of Inverts also: long black spin urchins, sea cucumbers, various snails and shrimp
<Shrimps may get eaten.>
I absolutely can commit to frequent water changes, especially with the idea of downsizing the number of tanks, so bioload shouldn't be an issue but compatibility and keeping a humane tank is my priority.
Can you give me some advice on who I should choose to be tank mates with Eel? Eel seems to be very cautious when eating. In Eels present tank when he smells food and accidentally finds a tank mate he just mouths them and backs off (at least for the past few years). He doesn't seem (at this point) to ever go after anybody to eat them or to harm them, but then again he is well fed.
<This depends a lot on the specimen. One certainly would not be able to keep my largest M. pavonina with medium sized tangs or rabbit fish in the long run, but if your moray accepted tank mates so far, it might be possible. However, it may also fail with time, since this species can get quite aggressive. Ensure to add anything you want to keep with the eel first and give them some time to get used to the tank.>
Thank you in advance for your input. Linda
<Welcome. Marco.>

Eel compatibility -- 01/21/10
Can you keep more than one aggressive eel in the same tank?
<Depends on the species and the specimens involved. Sometimes possible, sometimes disaster waiting to happen.>
I have a Gymnothorax eurostus (Stout moray) that is about 14 inch, I've came across a Hawaiian dragon eel that is about the same size for a low low price ($200), they guy really needs the money. I have a well established 100 gal with great filtration, double size protein skimmer, uv sterilizer and a refugium.
<Eels of the same size work quite often as tank mates, although some specimens may hardly accept any tank mates. However, the now still small Dragon eel will become significantly longer and at least twice as heavy in comparison to an adult G. eurostus. So, especially in the long run I see some danger for the G. eurostus. If you decide to put them together, ensure that there are enough caves (pipes, rocks'¦), watch them the first hour(s) with a net to separate them if necessary and be careful during the first feedings. Cheers. Marco.>

Re: Eel
Eel compatibility II -- 01/22/10

Thank you for your help and advice, I'm having second thoughts about it, I do not want to harm one due to my own needs, I have a 55 I may put the Stout eel in, if the tank is big enough and the dragon in my 100.
<Sounds like a better plan. Cheers, Marco.>

Japanese Dragon/Stout Eel
Eel compatibility III -- 01/26/10

I want to start out by saying I am a big fan and I really enjoy reading all the questions and answers other people have posted!!
<Great to hear.>
I'm thinking about adding a dragon eel to 100gal, which houses a strout eel <it's Stout eel, like obese, because they can get quite fat with age and they are also a little short for their weight. I remember your plans and your alternative of having the dragon in the 100 gal. and the G. eurostus in a 55.>, I have a lot of live rocks with caves already but I'm thinking about adding more rocks, can you add too much rocks?
<For eels? I'd say 2 pounds per gallon would be a reasonable upper limit.>
My Stout eel doesn't move around that much, he stays in one place, I have been reading that the Japanese dragon eel likes to move around and even stays out in the open sometimes once it gets use to the tank.
<Depends on the specimen. If it feels safe and bossy it may be more in the open as it would in nature with all those bigger fishies loving eel sushi.>
So I'm not sure if adding more rocks will take too much room. Any advice would be really appreciated.
<As noted before'¦ the idea of keeping them together might fail, since the Enchelycore will get much longer and heavier. If you still decide to try creating enough (stable) caves with well cured rock (because it's a running system) is a good idea. Cheers, Marco.>

Golden dwarf moray question: can more than one be kept in the same tank? -- 12/08/09
Hello WWMCrew,
<Hello Tony>
I'm having trouble finding a good answer to this question. I have found various conflicting accounts on discussion forums. I'm going to ask you guys because I don't think it's been addressed specifically in the moray FAQ pages (I looked, if it is there, then I overlooked it; my apologies!)
Excluding pre-established pairings, can more than one Gymnothorax melatremus be kept in a single aquarium display?
<It's impossible to give a definite prediction. Generally it is possible, but the first eel might start defending his territory. This can calm down after a few meetings or continue until one eel is hurt and has to be removed.>
Or is it, generally speaking, a bad idea to add multiple individuals to the same display?
<Chances are best if two eels of similar length are added together into a tank of sufficient size with many, many caves.>
Thanks very much, as always, I appreciate your insights. Tony
<Welcome. Marco.>

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