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FAQs about Seahares, Suborder Anaspidea

Related Articles: Sea Slugs, Nudibranchs,

Related FAQs: Seahare Identification, Seahare Behavior, Seahare Compatibility, Seahare Stocking/Selection, Seahare Systems, Seahare Feeding, Seahare Disease, Seahare Reproduction, & FAQs on:  Seaslugs 1, Seaslugs 2, Seaslug Identification, Seaslug Behavior, Seaslug Compatibility, Seaslug Selection, Seaslug Systems, Seaslug Feeding, Seaslug Disease, Seaslug Reproduction, & Marine Snails 1Marine Snails 2Marine Snails 3 Nudibranchs, Nudibranchs 2, Nudibranch Identification, Nudibranch Behavior, Nudibranch Compatibility, Nudibranch Selection, Nudibranch Systems, Nudibranch Feeding, Nudibranch Disease, Nudibranch Reproduction, Berghia Nudibranchs, Snail ID 1, Snail ID 2, Snail ID 3

 

Help ID Tank Spaghetti  11/14/08 Dear Crew, <Hello Andy.> It's been a long time since I rapped at you. I've been out of the loop because my tank crashed in September and I haven't had much to write about <Sorry to hear about that.> -my only inhabitants are a Kole Tang, a Sea Hare (Aplysia californica) that I borrowed from my LFS to deal with the incredible amount of algae that plagued my tank after the crash from (I assume) all the nutrients that were released when $3k worth of fish and coral disintegrated, and a bunch of hermits and snails. I know this Sea Hare is a temperate water species and will eventually starve in my tank, which is why I borrowed it rather than purchased it--I needed something big to eat an incredible amount of algae. Anyway, as I mentioned there is very little in my tank--I am letting my tank settle/re-mature and don't want to load it up with any fish for a few months. Almost nothing survived the crash, so almost all life other than the above is new that came in on a few new pieces of LR and some bristleworms, etc. that I transferred from my other tank. So, imagine my surprise when I found the attached on the underside of a piece of live rock tonight. This mass looks like a handful of spaghetti (same thickness and about 4" in diameter). It appears to be some type of egg mass, but the only thing that could have deposited it is the Sea Hare. Am I right on this? <Absolutely. These are sea hare eggs. Thanks for sharing. Do you know the National Resource for Aplysia at the University of Miami? You'll find information on the lifecycle, larval stages there. Rearing procedures are also briefly described on their website http://aplysia.miami.edu.> Thanks! Andy
<Welcome. Marco.>

Help ID Tank Spaghetti II  11/14/08 Wow, thanks Marco. Does this mean I'm going to have 8 million Sea Hares in my tank? <No, are they fertilized at all? I thought you only got a single specimen.> In the normal tank, would most get eaten by fish, corals, etc? <Even if you had two and the eggs were fertilized, few would have a chance. Not all would be eaten, the rest would be filtered, skimmed. If you want to raise sea hares you need at least two, and contact the National Resource for Aplysia and see their site for Aplysia production.> Thanks again. Andy. <Cheers, Marco.>

Help ID Tank Spaghetti III  11/14/08 I assume they are not fertilized--I have only one specimen, and I have had it for 4 weeks or so. I have no interest in raising Sea Hares. Thanks for your help. <Welcome. Marco.>

45 Gallon Fish Only Stocking 4/13/08   4/22/08 Hey Scott, <Hello Michelle.> Um...I bought a brown sea hare. <It sounds as though you already know the issues with this!> My LFS did not say that there were more than one species (they only had several of one kind in stock) so I don't know the specifics, only that it is smooth, brownish-green, is eating my brown algae and looks like a Hippo. And was duly named thus. I've sent a similar picture I found on the web, only mine is not as red because he eats brown algae instead of red. <I have no first hand experience with these guys, but am hesitant to recommend you try to keep it. Your tank is on the small side if the inking does occur and they are better suited to a reef setting.> But according to my LFS dude it is a peaceful sea hare with no problems in a peaceful tank (My LFS did not mention a thing about the inking. I'm glad my tank is peaceful.) I do not anticipate too many problems there, but I found out how to deal with it if it happens. <Good, be prepared.> I kind of don't understand about adding calcium and checking phosphates though. Is this something I should be doing on a regular basis now that I have the sea hare? <At least test calcium, Alk and nitrate every few days. This also assumes ammonia and nitrite are 0 and your salinity is good (1.025-1.026).> My main problem is that the sea hare seems to have a habit of coming to the surface. Is he trying to crawl out or is he just enjoying a breath of fresh air? <Likely just crawling around, looking for a place to go.><<Mmm, no... looking for an appropriate habitat. RMF>> Also, he appears to have taken a liking to the heater. Is this bad? <It can be. If your room temperature is high enough your heater may not be coming on at all, nor need to. In this case the heater is just another obstacle for the slug to crawl over. With heat radiating from the heater he should stay clear. One advantage of using a sump, remotely locating the heater.> To update my fish list, I have also added a copper-banded butterfly and a fire shrimp, since my LFS does not get in skunk cleaners over half an inch to an inch long. My fire shrimp hides a lot, which I hear is typical. <Yes, they do. I am sorry to tell you, but a 45 gallon system is too small for long term success with the butterfly.> The butterfly is thriving. I've been feeding (and seeing him eat with quite an appetite) frozen brine shrimp, and I got him supplements of sponge (since I have no live rock) which I'll be giving him twice a week. He appears to be at ease with his tankmates. He hides some, but I think he's still just acclimating. I've been thinking for a little while about some yellow or star polyps (only fluor. lighting); will he eat those? <He may, some do, some don't. Unless you have extra fluorescents you will have little success with these. The standard lights that come with a tank are just not enough for even low light corals.> I will soon add the Firefish and Banggai. The pajama cardinal is off the list and if I still have room I will add the royal Gramma, unless he's too aggressive for the copper-banded butterfly and sea hare to handle? <They can be aggressive. With your current stock I would call it good after the Firefish and cardinal. I believe in conservative stocking!> Thanks so much for the help, Michelle <Welcome, best of luck to you, Scott V.>

Uhh... inappropriate.

Infected Tank??? Aplysiid sel.   4/1/08 Hi Bob, <Cynne> Hope this finds you well. Once again I have encountered a question regarding stock. The tank is the same as I described before. I now have 90 % of the Scorpions on frozen food, as well; I have followed your advice and purchased the Aqua C Remora Protein Skimmer with Mag 3 pump. I also have increased to a 4-6 inch sandbed with some aragonite. The Scorpions are so much fun :) I cannot believe that I enjoy them even more than the seahorses. <Both have/exhibit interesting behavior for sure> I no longer have the starfish; I sacrificed him about 2 months ago for a CopperSafe ich treatment (entire tank). I had to choose between the $17.00 starfish or the $1000.00 fish. I have since changed all filter media, changed 100% of the water in 25% intervals over a couple of weeks and rebuilt the biological with rock rubble from the LFS. I also continue to run poly filters and charcoal in the Aqua Clear. My question is I recently purchased a sea hare. I have always wanted one, but was afraid of inking. <Mmm, not an issue with many... tropical species. Unfortunately there is a current rush of selling large, non-tropicals...> I have searched your site but am still unsure as to what I have. According to one of Anthony's replies, I found that any Sea Hare with tassels is Carnivorous? <Mmm, no... not a sure characteristic> The pet store said this one was a Herbivore and they weren't sure regarding toxins. I also found one currently running on EBay and according to the seller; this guy isn't toxic http://cgi.ebay.com/NANO-Hairy-Sea-Hare-Reef-Aquarium-Live-HAIR-ALGAE_ W0QQitemZ290207618335QQihZ019QQcategoryZ66788QQrdZ1QQssPageNameZWD1VQQ_ trksidZp1638.m118.l1247QQcmdZViewItem. They also advertise this as a Nano size, Yet he looks a lot like the one on your FAQS page 2nd photo. <Mmmm... is this Bursatella leachii? Am thinking so... get's a bit large for nanos, but is tropical...> I bought him in NC, I am desperately hoping he is not a cold water species. He is fat bodied brown to green in color with black splotches. He also has baby blue specks all over the body and head, as if someone splashed paint on him, and he is tasseled. Please help I can get whatever food he needs. I just need to know what to expect. The fish do not mess with him at all and all intakes on filters and power heads are covered. Thanks again for all your advice!! You guys are great!! Cynne <Do see the Net (Google images et al.) for pix, ID... BobF out in Borneo>

Re: Infected Tank??? Seahare ID   4/4/08 Hi Bob, Thanks to all of you once again for quick response and intelligence beyond compare. You pegged it!! Bursatella Leachii he is. I could not find him on your site, and the internet was still a little contradicting. So what to feed? Life expectancy? Toxicity? Thanks Again Enjoy Borneo!! Cynne <I know naught other than what can be found on the Net also... did collect/culture Aplysia californica years back... but this is about all of the group. BobF, done diving and headed back tomorrow>

Surprise critter: Sea Slug? ID sources - 1/5/08 Hi all, <Hi Richard!> First, thanks for sharing so much info on WWM - it's a big help! <Thank you, it's our pleasure!> I've just set up my first marine tank (after 20 years of FW tropical). <Such a wonderful, rewarding hobby -- welcome to reefkeeping!> It's been cycling for nearly 2 weeks. I kicked the cycling off with about 4kgs of LR, which I'm told came off the Victoria coast (Oz - I'm in Melbourne). <Lucky you! I am determined to get to Australia one of these days. The Great Barrier Reef has always been at the top of my list of places to see/explore.> Ammonia and nitrates are currently at 0ppm, although nitrites are at 2.5. <Will subside/cycle out.> I've got a healthy supply of copepods & amphipods flourishing already, also some snails. <Yay!> Tonight I happened to pass the tank with the lights off and spotted something strange on the back glass. I turned on the lights and saw what appears to be a small sea-slug. Unfortunately due to the amount of algae starting to grow already, my camera wouldn't focus, so no photo I'm afraid. <Darn.> It's a teardrop shape, about 15mm long, 5 mm wide and a brownish red in colour. It has two white feathery antennae at the thin end of the teardrop and three small white spots on it's back - almost a small smiley. <Oh I know, I know! It's the rare and elusive Smiley Nudibranch, family Smileyidae -- just kidding <g>. Sorry, I couldn't resist!> It's quite flat, although the centre of the back is raised about 3 mm. Any suggestions as to what it could be? <Unfortunately, there are just too many possibilities and without a photo...?> I'm planning on keeping seahorses in the tank in another month or so <Go slowly here.> and I'm trying to avoid nasty surprises. Algae eaters would be fine though... <Understandable. If it were me, next time I saw that little guy, I'd get him out of there.> Also, is there any kind of marine creature search engine on the web into which you can enter distinguishing features? <Not per se - that covers all marine creatures. At least, not that I know of.> Seems like something that would come in very handy for many people :-) <Yes, indeed! In lieu of one specific search engine, there are many sites on the web that can help (including WWM!). I'll give you some of my favorites. The first will be of particular use for you as it covers crustaceans of southern Australia. You may find some of the amphipods/copepods/etc. populating your tank here: http://museumvictoria.com.au/crust/page1.html Here's another site that's run by a friend in the Philippines: http://home2.pacific.net.ph/%7Esweetyummy42/hitchhikers.html This site is Dr. Shimek's dichotomous key -- very handy indeed! http://www.ronshimek.com/Invertebrate%20Key%20to%20Major%20Taxa.htm Great sites regarding Sea Slugs: http://pick4.pick.uga.edu/mp/20q?guide=Rhabditophora&flags=not_no http://www.wetwebmedia.com/seaslugsopisthobranchs.htm http://www.seaslugforum.net/ I hope these help. I've got a gazillion more on file, but these should get you started!> Many thanks, Richard <You're very welcome! Take care -Lynn>

Update: New marine tank with surprise critter - Nudibranch? Sea Hare - 3/8/08 Hi Lynn, <Hey Richard! How's my favorite Aussie doing?> Thanks very much for the info you sent me. <You're very welcome.> The 'smiley slug' disappeared for a little while, but a couple of weeks ago surfaced again. <Neat> It's grown somewhat (35mm+) since I last saw it, and I just wanted to let you know that I'm now sure it's Dolabrifera dolabrifera, the algae eating sea hare. <Yay, congratulations and good on you for figuring out what it is! Thanks, also, for letting me know. Neat little creatures like this tend to lurk in the back of my mind until they're identified.> In fact, I seem to have about five of them, and although the smiley looked quite different when it was young (appeared to have a smooth back and white markings), the similarities between the mature hares really make it obvious. <Awesome> Now that I've watched them in action for a few weeks, the following are pretty clear: - They don't eat anything other than algae. - The colours come from the particular algae that they're eating (slowly changes over a period of 5 - 6 days). Seems likely that the red pigment doesn't penetrate all parts of the body - he's now pinkish brown with green ears :-) <Heeeee! It's the Easter Sea Hare!> - They're indifferent to what colour slug they mate with. - They're not the smartest critter in the world and often can't tell the difference between a rock and a seahorse (much to the surprise of both parties when they go for a ride) <Wheeeeee! Yep, it doesn't exactly sound like they're sharpest tacks in the drawer!> Cheers, Richard <Thanks again, Richard, for following up with this and for sharing your observations! Take care and have a great weekend, -Lynn>

Sea Hare Splitting? 10/23/06 Hi WWM crew, <Hello Ryan> I have a 35 gallon saltwater tank. There is a Coral Beauty, orange star fish, three crabs, and a Sea Hare. I woke up this morning and I saw my Sea Hare's skin splitting down the middle. There was something that looked like a white larva where the skin split. I took out the Sea Hare and moved it to a quarantine tank, because I heard they can kill your other fish when they die. <Indeed.> It hasn't moved around in the quarantine tank so I think it's dead. Do you have any idea of why it did this, or how I can prevent it in the future? <Most Sea Hares, if not all, are very difficult to keep.  Should only be attempted by expert aquarists.  They do not appreciate bright light and are algae grazers.  I'm quite sure none of these conditions exist in your tank.  Try something a little more easier to keep in the future.> Thanks for your reply! <You're welcome.  James (Salty Dog)> Ryan Forsman

Sea hare growth ... no info.   5/4/06 My sea hare has a what I can only describe as a growth on the side of her head, it started off as a little growth but by the evening it has grown really long, part of it is long and thin and the end piece is bulbous and a pale blue green colour she is still alive, any ideas???        Thanks for your help            Ellire <Perhaps a tumor of some sort... I'd be checking your water quality, moving the animal if you have another "clean" system... doing water changes, employing chemical filtrant/s if nothing else. Bob Fenner>

See here... Sea hare 5/3/04 Tube Anemone Good evening my wonderful reefers! lol <live it, swim it, smoke it... er, well.. two of those things at least> I won a Aplysia dactylomela the other day at a raffle.  I won it on purpose out of sympathy, I didn't want it to end up with some poor bloke w/out a clue where it would starve to death. <interesting... perhaps a polite mention to the club/donors to be more conscientious about submitting items of challenging needs for random win/purchase by others> After a bit of hunting around my tank for some red algae (which proved non-existent, the info on the specific type of algae these guys eat is rather lacking, a lot of authors say they eat red algae they just don't specify what kind! I think it must also take them a while to adjust their diet to green algae) <I do not spy it quickly at hand... but we have a link in our bibliography for our Reef Invertebrates book to a web page that lists the exact foods for many species of opisthobranchs> I tried putting in some red/purple Nori by Two Little Fishies (Julian Sprung & Co) and my guy started to chow down. Since then all it does is eat and sleep. hehe <Ahhh... good to hear> I was wondering if you could tell me approx how long this sea hare lives?  I've read from 1-2 years is all.   <hmmm... I am not certain, although I recall the larger temperate species living somewhat longer than the typical 24 months or less> Do they live longer if they don't mate?   <nope... not to my knowledge. There is precedent to support this in other mollusks (like the famous octopuses with a defined lifespan, breed or no)> It's funny, I live in Miami and went snorkeling the other day and saw a mated pair of Dactylomelas.  I didn't know mine was the same even though I've seen them many times when I snorkel. Also, treading into dangerous waters... are there any colorful Nudi's that can be easily kept in a reef tank or is this a lost cause? <hmmm... sort of. The key to any Nudibranch is identifying and supplying their food source. Many will keep and breed easily if you can do this. I keep an active colony (several hundred!) of beautiful blue Berghia (Aiptasia eaters). Other folks keep and breed Elysia sp algae eaters... some folks even dabble with the Zoanthid eating species. The problem with keeping in reef tanks is that most such systems have excessive powerheads and overflows. If you plan well though, you can keep some beauties> I always feel so bad when I see these really amazing looking, doomed Nudi's at the LFS.  There should be a campaign on to stop the collection of specialized feeders such as these. <no formal campaign is needed. Educated aquarists simply vote with their dollars and do not buy them. They die in the dealers tank, and when it happens enough times, the dealer stops ordering them <G>. You might help this along with  a polite mention of the reality (supported by a helpful list of web links or photocopied documents) that you give to the LFS. If that doesn't work... tell us their name and we'll post them on the wall of shame <G> Ha!> Oh, about how big will a tube anemone get in a reef tank?   <it won't... because it does not belong in a reef tank and will never be placed there by a conscientious aquarist. If you know of anybody tempted to the contrary, please direct them to our extensive archives at wetwebmedia.com for an explanation why not <G>> Will I need meters of sand eventually? lol I hope not. ( <8-12" would work nicely... let it mature for 6-12 months before putting a Cerianthus in a species specific tank (no corals or other anemones unless you intend to sacrifice some)> Ah, the pot calling the kettle black I know, but I'm going to try and provide for it) It's only 3 inches long at the moment and eating fine. <sigh... disappointing> Thanks for all your help! Love you guys, Morgan <sob...sob... another anemone destined to be a statistic. Anthony :p>

Sea hare?... pass 4/12/04  Hi There  <howdy>  My LFS has sea hares they are selling for which they claim is algae and Cyano control. I have heard before that the sea hares can consume Cyano.  <some do>  These dudes are real ugly rock like critters. Do they really help control red algae/Cyano??  <its likely a moot point. The few sea hares that make it into the aquarium trade are typically temperate species (cool waters). They are naturally short lived to begin with. Not a safe or recommended choice IMO. Furthermore, they would be treating the symptom (Cyano) and not the problem (nutrient control). Focus on the latter my friend... we have many recommendations for this in the archives. Do a keyword search from our home page at wetwebmedia.com for "Cyano", "sea hares", "nutrient control", etc. Anthony>

Waging war on hair algae Bob, <Mike G here> I wanted to get your thoughts on introducing a Sea Hare to take care of some painful green hair algae? <Sea Hares are wonderful consumers of hair algae. It may aid you in physically removing algae, but will certainly not solve your problem single-handedly. They are messy eats, and minute particles of Hair Algae WILL get released every time they take a bite. Also, their feces will contain partially digested hair algae, and possibly hair algae spores. A sea hare would be a wonderful warrior in your battle against hair algae, but you need to also eliminate the problem that is causing the algae in the first place.> I've had the aquarium up 8 years and have never had a battle like this with hair algae - I feel I'm starting to lose the battle. <That's a very common feeling when one is pitted against hair algae. I had problems with it when I first started my tank (15g). It was completely eradicated by doing 2 gallon (10%) water changes every other days and by adding a refugium of 25% of my water volume (5g) to my system.> It's been going on 8 weeks now. I've seen 2 Sea Hare species for sale: Aplysia punctata & Dolabella auricularia. Fosters & Smith rates Aplysia punctata as extremely delicate/expert with serious negative affects from possible ink secretions. Aplysia punctata isn't found on WWM. <I recently purchased a Sea Hare to control my Caulerpa problem. The only species available was Dolabella auricularia. I can assure you that he does a goodly job on Cyanobacteria, Bryopsis, bubble, and pretty much any microalgae he comes across. I think that if he were to come across hair algae, he would eat it with gusto. Of course, he does not eat Caulerpa. It figures.> Dolabella auricularia is mentioned twice on WWM and a seller of it praises its traits without a mention of any issues with the species. I know it also secretes ink as well, but what about hardiness? Would you pick one over the other & how toxic is the ink? <Mine has "inked" in my tank twice now...either time with absolutely no negative effects. Granted, I do run a skimmer that is quite large for my tank (CPR BakPak), and I did a 10% water change as soon as it inked. Upon researching hares, I have found that Aplysia produce a considerably more toxic ink than Dolabella. I think a Dolabella would be the way to go if you decide on getting a Hare. As a side note, the hare toxins can be easily removed with carbon and a water change.> For back ground, I've been following all the algae reduction husbandry: All water changes & evaporate top-off done with buffered/aerated RO water from Kent Maxxima Hi Silicate (changed out all membranes 4 months ago), 30% water changes every 2 weeks (every one now), thaw, rinse & strain food prior to feeding, careful not to overfeed, 1800+gph turn over, over-powered skimmer (AquaC EV120), 45gal refugium w/ DSB & Chaeto, 520w PC lights that were recently changed, phosphates reading zero, but running PhosGuard as precaution. The green hair algae is still kicking my tail. I think I've narrowed down the original cause to a partially blocked line on my skimmer, which started the outbreak 12wks ago and then was fueled by a continuing die off of all my turbo snails (past email). About 6 weeks ago, 20 Turbos went through QT for a month - lost about 3 in QT. At the time, I thought it was just a natural/unlucky die off. Since they've been introduced into the main tank I've lost about 18. Originally, only the new ones seemed to go. My old ones are covered in coralline algae, so they were easy to tell apart. Now the old ones are going too, seems like one every 4-5 days and that's just the ones I can see. My 30+ Cerith & 40+ blue legs seem completely unaffected. My two "indicators" - RBTA and Hippo tang couldn't be better. I brought the Turbos in to help combat algae problem - now I think they're fueling it. I'm to the point now of thinking about taking all the Turbos out & putting them into QT. Any thoughts? <Certainly. If I were you, I would remove all of the turbo snails, as they do not seem to be doing anything more than providing nutrients for an algal bloom. It sounds as if your refugium is completely adequate, so you can't really expand on that. What really ended my hair algae infestation were 10% water changes every other day. This may be extremely difficult for you considering your tank and refugium sizes. However, It may very well be worth a try. You may also want to look into a high quality phosphate reducer. Lately, more and more people have been reporting success with PhosBan. It really all depends on what you think would work best in your situation.> I've been scrubbing the LR manually with a toothbrush & then immediately doing a water change to try and remove as much of it as possible. Last week I thought I delivered the final blow by spending 4 hours and manually scrubbing every single piece of my 180lbs of LR, one at a time, always submerged, in a bucket of saltwater from the tank. I used 3 separate buckets of saltwater to keep the algae export as high as possible. I certainly staggered it, but it looks to be getting back up. With the toothbrush method, do you think I'm doing more harm than good by spreading it around? My thought was that dislodging it and removing some though the filter & water change would be more effective than just letting it grow unabated. Any other advice? <I think that you are only spreading it more when you scrub it off the rocks. You are releasing minute particles into the water, which can easily find new places to lodge and form new "colonies" of algae.> Since I've been way too involved in algae recently, I wanted pass on a personal observation that the most productive hair algae remover in my tank is my Foxface Lo (Siganus vulpinus). After watching my tank for hours, he is certainly outperforming my robust lawnmower blenny and seems to be getting the better of my spineless clean-up crew. I've seen him wipe out 3 long sprigs of hair algae in a 90 second window. I just haven't seen him get much press for that on WWM or anywhere else and besides, he's a gorgeous fish and I haven't seen a single negative trait from him (having slightly venomous spines probably doesn't help him, but I'd find it hard to see how I'd get stuck by him). Just wanted to sing the Rabbitfish praises a little. <Rabbitfishes are well-known and wonderful herbivores. Glad to hear yours is working out for you.> BTW - wanted to get your thoughts on a sump/refugium I've designed and am thinking about having built. Especially concerning transition methods from one chamber to the next. I've attached the layout. As a note, the PVC return pipes in the refugium will be covered by a 6" DSB & the 2" ball valve into the refugium is designed to support complete gph control through the refugium. The overall design goal was to maximize the efficiency within the footprint & have an uncluttered/clean appearance. All my aquarium equipment is in the mechanical room below my office, so space isn't an issue. My current sump/refugiums were born from a series of upgrade bolt-ons over the years. Restricted water flow through the refugiums, wasted water volume due to in-line plumbing spacing & general clutter were the reason for the potential new sump. <I see no problem with your design for your sump/refugium.> So sorry for the length of the note - I just realized how long it is. Obviously, I'm excited about the hobby and can't express the gratitude in having the joint knowledge of WWM available to me and other enthusiasts. Get to me when you can & feel free to break the note up if it makes for easier reading. <The length of your email is not a problem. I can only hope that I have provided answers to all of your questions. Mike G.> 

Sea Hare with a Mascot? I just bough a sea hare yesterday he is about 5 inches long and pale yellow with round black O's on him. <Cool> Today I saw something come out of his hole. It looks like a little pink crab about 1 cm. The crab was then crawling all over my sea hare. Should I try the remove the little pink crab? and if so how? he is very small.
<I would quarantine all new purchases so that removal is easy.  I have no idea what sort of crab this is without a picture, or if it is suitable for your system because you haven't included details.  Picture perhaps? Ryan> Thanks for your help



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