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Lettuce Nudibranch; stkg., comp.
9/16/15 wall street journal query on sea slugs
2/11/13 Hello! I am interested in getting Tridachia crispata, and Nudi sel.
-- 4/17/09 <Mmm, maybe... I'd be careful re the placement period... if this slug becomes "free floating" it could well be sucked up against any intake> Should I get a plastic mesh screen? Also I saw a Glossodoris sedna for sale. Can they be kept happily in captivity? <Not often the case with any Nudibranch, no...> Is it better if they are left in the ocean? <In the vast majority of cases, yes. See WWM re providing for such.> Thank you for your time. Logan <Bob Fenner>
R4: Vacation - Power Failure - Nuclear Holocaust, and Aplysia sel. -- 09/26/08 Doh! Sorry, Eric. I was reading a post by Neale and I guess his name was in my head. <<LOL! He writes some informative and memorable posts for sure'¦I should be flattered to be confused with... No worries Andy!>> Thanks for your help (again). <<Always welcome, mate>> I am not wavering--I am committed to going fishless for 4-6 months. <<Great!>> I was looking in my sump and tank this morning and saw lots of pods crawling around, so I am very happy. <<These will recover quite quickly with the improved conditions. And I know you said you were not feeding the tank, but these critters (mainly Amphipods and Mysids) are very predaceous, to the point of eating their own. I have found that a few shrimp pellets every day or two tossed in to the sump and refugium can go a long way towards boosting populations>> I also opened up my fuge to take a look and boy oh boy has my Chaeto grown since the crash. <<Ah'¦no doubt>> My 30g fuge was jam-packed, side to side, top to bottom, with Chaeto. I thinned it out by about half (I usually trade this to my LFS for store credit, but they are such a pain to deal with . . ..,I just decided to chuck it). <<Excellent'¦but too bad about your LFS'¦some folks are just short-sighted>> I set my light cycle at 6 hours for the MH and 8 hours for the actinics (usually I run 9 hours and 11 hours, respectively). <<I see no reason not to go back to your normal schedule'¦is closer to a 'normal' tropical cycle too>> The Astraea Snails I added are doing a good job of eating the algae that's accumulated on the glass. I was thinking of adding a Caribbean Sea Hare to this mix, as I have had good success with them in the past. <<Mmm, okay'¦then perhaps you already know to be cautious of getting a 'temperate' species'¦often sold as 'tropical'>> My skimmer is still pulling a decent amount of skimmate, so clearly dissolved organics remain. <<Don't ya just love skimmers!>> Take care. Andy <<And you my friend. Be chatting, Eric Russell'¦(not Neale [big grin]) >> R5: Vacation - Power Failure - Nuclear Holocaust -- 09/26/08 Eric-- <<Andy>> I want the entire FAQ's for today to have the heading "Vacation - Power Failure - Nuclear Holocaust", so I'm going to respond to you yet again ;-). <<Ha! We're well on our way!>> Actually, I believe it was you who taught me long ago to feed my fuge/sump with shrimp pellets, and I have been doing that since you taught me and since the crash (what I meant by not feeding the tank was, I'm obviously not doing what I normally would if there were fish/coral in the tank). <<Ah! Excellent>> I am well aware of the problems with the sale of sea hares. I have read such warnings here and in Calfo's/Fenner's Reef Invertebrates. <<Indeed>> The Caribbean ones are easy to distinguish from Aplysia californica, which unfortunately is what most of my LFS sell. <<And many others>> Whenever I see them on display, I make it a point to tell the owner that he/she shouldn't be selling Aplysia californica to anyone that doesn't have a temperate tank--they look at me like I'm speaking a foreign language. <<Not uncommon, I assure you>> I even had one self-professed expert LFS owner say "Really? They come from California?" <<dismal'¦>> Sadly, one of the more reputable vendors, That Fish Place, sells them and notes in their specifications that they come from the Indo-Pacific, which is clearly false. <<Perhaps you could send them a note re>> As I'm sure you know, the Caribbean varieties aren't as big or interesting looking, but that's no reason to buy them. << The Sea Slug Forum states that Aplysia californica has been reported to reach more than 30' in length! Aplysia morio can grow to about 18' though I don't think it is a regular in the trade'¦the smaller species you refer to is probably Aplysia dactylomela which grows to about 6' and is a much more appropriate species for reef aquaria use>> I will put my lights back up to a normal schedule and let the greening of the tank continue! <<Enjoy the adventure!>> Thanks again. Andy <<Cheers mate. EricR>> Lettuce Sea Slug, as algae eaters... -- 09/08/08 Hi all, I have read a couple places that lettuce sea slugs can be used to control green hair algae...is this true? <... by and large (in actual application in hobbyists systems, no... These slugs only eat certain varieties/species... and the types found in aquariums... are rarely amongst these. Bob Fenner>
Sea Hare death(s) 04/14/2008 Thank you for a wonderful site. I apologize for asking a question when I'm sure the information I'm looking for is already posted but I seem to be handicapped in search engines as they always seem to return matches where every single word is accurate, yet somehow out of context. <Ah, yes... GIGO... a need/arena for learning the field/terms, use of Boolean logic... as it applies to such searching perhaps> I have a 90 gallon marine tank FOWLR containing a Yellow Tang, Blue Tang, Coral Beauty, Six line Wrasse, 2 percula Clowns and 3 blue/green Chromis. I started seeing string hair algae of the kind no fish eats (naturally) and by the time I recognized I had a "problem" rather than a simple "event" the algae had taken a pretty strong hold. I corrected the problem (phosphates and a bit of overfeeding) but the algae remained. On the advice of a local pet store I purchased two sea hares <Mmm, what species? Too often cold-water species are offered...> and they went to work immediately! Not only were they in the process of cleaning the tank nicely but I've decided that they are at LEAST as interesting as any fish, so I was looking forward to a long an happy relationship. I came home from work one day to find one of them dead .... with a huge split right up the center of his back, all the way from the vent hole to the neck. Without a picture the best way I could describe it would be if you could imagine a pressure split along the seam of a plastic bag as opposed to any sort of gash from an attach or contact damage. I took him back to the store to see if they could explain what went wrong and they said ... stop me if you've heard this before ... they've never seen that before, never heard of that before, can't imagine any animal or event that caused that and would I like to buy a replacement? <Mmmm...> (um ... not at this time, thank you). Two weeks later the remaining Hare was busy at work at 10 am and dead of the same cause at 2pm. The precision of the split (no rough edges at all) and the symmetry of it (right down the center of the back) as if sliced with a scalpel are very troubling. Do you have any suggestions? Thank you, Gil (not a pun!) <A need for a ready identification. Please read here: http://wetwebmedia.com/seaslugid.htm I suspect you have/had non-tropical species... that don't live in warm settings. Bob Fenner> Lettuce Sea Slug 3/10/08 This question is for Scott V. I have a 28gal reef tank with a few peaceful fish and was wondering how hardy lettuce Nudibranchs were? <Not a true Nudibranch, actually a slug. These do tend to be a hardier selection.> I would really like to keep them but don't want to just watch them die! <The question is one more of food supply in your tank for the slug. A link to a great article on these for you below.> Please help thanks. <Welcome, I hope this helps, Scott V.> http://www.advancedaquarist.com/issues/oct2004/invert.htm Sea Hare/Systems 2/28/08 Hi <Hello> I was thinking of purchasing a sea hare, however I am a little concerned with the fact they produce poisonous ink. If none of the other fish provoke it could it still ink? <Possibly, and can release the ink upon their death.> What would happen if it was to die would the ink be released? <Could lead to the death of other inhabitants. I very good chemical filter is needed to remove this compound if released.> I have a 180 gallon reef tank with a Clown Fish, Yellow Tang, Hawk Fish, Sleeper Goby, blenny, and various corals and a few different kinds of shrimp. Would this be a good set up for a sea hare? I have an abundance of algae. <Adam, these animals are very difficult to maintain and I would discourage you from getting one. It will eventually die and cause problems for you.> Thanks, <You're welcome. James (Salty Dog)> Adam Aiptasia & Sea Hare comp.... & Bio. alg. contr. 2/3/08 Although our 55 gallon FOWLR has been doing fine (fish growing & happy, no death, stable water) I have three nickel sized Aiptasia and some hair algae. Can/will the sting of an Aiptasia injury or kill a Sea Hare? <Won't be the best combination but certainly not the best solution for both problems. For the Aips see here: http://www.wetwebmedia.com/marine/inverts/cnidaria/anthozoa/aiptasia/aiptasia.htm. And the causes of the Hair Algae must be addressed first. The Sea Hare will just be recycling the nutrients the algae use. Read on Nutrient export etc. Olly> Re: sea hare, stolen image/s (we don't post), coldwater animals misplaced in tropical settings 2/1/08 probaly <?> not eaten sense it was larger then all the fish in my tank about 3 inches. I am attaching a picture of what it looked like but mine was greenish tan <... this is a "lifted" as in stolen image of an Aplysia californica... a cold water animal... Misplaced if this is what you have. Please, read here: http://wetwebmedia.com/seaslugcomp.htm and the linked files above. Don't write us, read. Bob Fenner> Help! Dead sea hare, wilting LTA, high nitrates 11/08/07 Hello WWM, I hope you guys can help, I have searched your site and can not find anything near what happened to my aquarium today. I have a 75 gallon with the two clowns, LTA, a yellow tail damsel, Chromis, royal Gramma, snowflake eel, choc chip star, and Bahamian star. <What species is this last?> Everybody has been living together peacefully for 3 months. The system has been running for 6 months. I have 3 powerheads, 75-80 lbs live rock, crushed coral as substrate. On Sunday I added a sea hare <...? What species? Many sold are coldwater> to help control some algae. Today I can home from work to find him sucked into one of my powerheads, and my CC star eating him!!! <... not uncommon> I got the CCstar off and took the powerhead and sea hare out. I was unable to completely get the sea hare out of the powerhead so I just threw the powerhead out so I wouldn't contaminate my tank by putting it back in. <?!> I immediately checked all my levels and found my nitrates had risen. 2 days ago my nitrates were 0 and now they are at 10ppm. My ammonia was 0 two days ago, now it seems to be between 0 and 0.25.(which I expected to rise due to a dead critter) Nitrates:0 Phosphorus:0 pH: 8.2 specific gravity: 1.023 <I'd raise this...> I am assuming I need to do a water change, however will be unable to until tomorrow. I just did a water change a week ago so I don't have any RO/DI water on hand. (lesson learned about having reserve water!) When I got home my LTA was spread out and looked perfectly happy. Now, about an hour after I removed the powerhead and dead sea hare I noticed my LTA has begun to wilt and start to deflate. Everybody else seems perfectly happy in the tank, at this time. I have not fed the tank or done anything else to it. Am I just overreacting to my LTA's behavior? Could it possibly miss the powerhead? Or is it due to the sea hare disaster? <Much more likely the two former...> What is the best thing I could do right now? PLEASE HELP!!! Thank you for all your wonderful help and wonderful site. ~Michelle <Welcome. I would do nothing overt here. Likely all will be fine. I'd clean up and return the powerhead. Bob Fenner> Elysia viridis. Looking For A Bryopsis Grazer - 05/06/07 Good Morning all, <<Greetings>> I have been working on a Bryopsis problem for a while now and have been doing regular water changes to combat the situation. <<Have you looked through our info re nuisance algae? Raising your system's pH to 8.5/8.6 and keeping it there for several weeks has shown anecdotal proof of helping to eliminate this pest alga>> My battle has lead me to research additional means. <<Ah...ok>> I have found that a sea slug of the order Sacoglossa, Elysia viridis, has made claims to eat Bryopsis exclusively. <<Mmm, not "exclusively"...at least not according to seaslugforum.net>> The problem I am having is finding this slug in stores? <<I think this animal is more a cool/temperate species than a tropical species, based on its distribution in the Northeast Atlantic>> I have been told my LFS that the Lettuce Sea Slug is the same thing as the Viridis, however I am not sure if they are. <<Elysia crispata (Lettuce Sea Slug) is a distinctly different species from E. viridis hailing from different locales...and quite apparent when viewed>> I know they are of the same family but not the same species? <<Correct>> Can you help me decided on whether or not to buy a Lettuce Sea Slug for my battle, or if not, where I can obtain an Elysia Viridis? <<I would NOT buy the Lettuce Sea Slug. Little is known of what these animals really eat (even though they are actively marketed/sold as grazers of "hair algae"). Many of these slugs are able to harbor the living chloroplasts of the algae they consume which continue to photosynthesize within the body of the sea slug, providing it with sugars for its own nutrition. E. crispata have been found to contain the ingested symbiotic plastids from Halimeda incrassata and Penicillus capitatus...hardly "hair" algae. My own anecdotal observations and experiences would seem to bear this out as I have never known one survive more than a few weeks to months in a home aquarist's system, even with an abundance of hair algae present, as they all seem to ultimately shrink and die from starvation. I think a better choice of slug to try would be from the genus Aplysia...the Sea Hares. These slugs; at least in my opinion/experience, are more hardy and much more likely to consume the filamentous algae than E. crispata>> Thank You for Your Time <<Happy to share. EricR>> Sea Angels... pteropods... opisthobranchs... - 05/10/2006 Hi, < Hello! > Can you purchase a Clione for a pet ???? < I have never seen them on any list of availability. > Is it legal to have them in the United States . < I am not sure about that one. > I would love to have one, they are so relaxing to watch them swim around < They may be obtainable through scientific supply houses. I strongly urge you to learn about their feeding habits, and learn how to raise their food first! There is more information to be had at http://en.wikipedia.org/wiki/Clione . > Cheryl Chafatelli 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 sel., comp. 12/30/06 OK, so after moving my tank (150g Berlin, 250lbs live rock, light bio-load) I had a huge outbreak of long green hair algae. Covered everything. Tried cutting back on the light, but I only achieved making it's color less attractive. After reading all I could, I decided I didn't want to go with scraping, chemical, etc....but add a natural solution. When weighing out the pro's & con's of such grazers, I settled on a sea hare, <Mmm, what species?> as it seemed to be the most voracious grazer. I wasn't so worried about it dying, as my tank is quite healthy and there is much for it to eat....... but with such a nocturnal creature, how on earth would you know if something that you rarely (if ever, lately...) see? <Mmm, the results of their night-time foraging?> Also, in a 150g, how much pollution/death could I be facing if I do not find the body? <Could be appreciable depending on the species, size... your filtration, maintenance...> 250lbs of rock is a pretty sizable pile to dig through. Thanks in advance, my briny friends! -Pat <Do take care to try a tropical species (not a cool/coldwater one), that is, and stays small-ish. You have read here?: http://www.wetwebmedia.com/algaeconMar.htm and the linked files above? There are other "biological means" to consider... Bob Fenner> Greek Goddess I went to my local fish store and seen a Greek goddess it was deep blue and purple. I have never seen colors so bright before. Is this creature a slug, snail or what? <yes on all counts... AKA shell-less snail, sea slug> also is it reef safe? thank you frank. <tough to say...no one can keep them alive. If your LFS ordered this animal (as opposed to having received it on substitution/without ordering it) the I have little respect or regard for their irresponsible business practice. Please admire this animal from photos for now. Anthony> Tank Update and Nudibranch Question (refugium and algae control FAQs) Hey Bob, Just wanted to give you an update on my tank. My nitrates are down to 30 after 3 weeks of weekly 25% water changes. Am still battling some hair algae but everything seems to be doing well. <Ah, good> Since I have some left over money I have decided to buy a CPR hang on refugium. I want to put some of my remaining tang heaven and get some more algae to help me export more nitrates. Have you ever used one of these units or have you herd anything about them? <Yes, we have some of Suk, Tom and the boys from Arcata (CPR) refugium units on test tanks... with about the same CF lighting we all use... We've been building, using very similar gear (ours have skimmers, calcium feeders on them in addn.) for years... these do work> Also, I have been seeing algae eating Nudibranchs advertised on several web sites. (some call them sea hares) The also say that they are easy to keep. Is this just a marketing ploy or do these really eat hair algae and easy to keep? <IMO/E more of the ploy... don't like the use of Aplysiids (Seahares) for this application... can/do cause some real troubles with water pollution at times... Would look to other algae eaters> I certainly wouldn't want to buy one to have it starve and die in my tank possibly killing all of its inhabitants. Thank You, Jonathan Pac <Good point... Do read, re-read the most recent updates on "Marine Algae", "Algal Filtration", "Algae Control" on our site: www.WetWebMedia.com here. Bob Fenner> 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 godly 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> |
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