Green Slug?
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DancingShark
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Some type of nudibranch, am not to good at iding things
corey01
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I dont have an ID for you. but on a semi-positive note generally nudis are camouflaged to blend in their natural hunting area/prey.
with him being a green color there is a "higher" chance they he wont be harmful to corals or a major nuisance. there is a pretty good chance he eats algae.
Ive had a few nudis over the years show up and all the coral eating ones have striking colors/fluoresce under blue light from the ingested zooxanthellae.
the other bland colored ones have never harmed anything important/that I noticed. I even had a jet black one once that was eating black sponge growing in a corner of my rocks. it was really cool.
I am not condoning leaving him in the tank if you are uncomfortable with it, and this is all speculation/opinion on my part. if someone comes along with a proper ID please defer to their post.
with him being a green color there is a "higher" chance they he wont be harmful to corals or a major nuisance. there is a pretty good chance he eats algae.
Ive had a few nudis over the years show up and all the coral eating ones have striking colors/fluoresce under blue light from the ingested zooxanthellae.
the other bland colored ones have never harmed anything important/that I noticed. I even had a jet black one once that was eating black sponge growing in a corner of my rocks. it was really cool.
I am not condoning leaving him in the tank if you are uncomfortable with it, and this is all speculation/opinion on my part. if someone comes along with a proper ID please defer to their post.
wowkingjames
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He so cool, thanks for the info. 
cristata.reef
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@Kamden Uelton do your thing
Kamden Uelton
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Caulerpa Slug, Oxynoe antillarum I believe. If you do not want it can you ship it to me? I can pay shipping and whatever else you want, I am very interested in these types of slugs haven't gotten one before and believe me i've seen TONS of Caulerpa hitchhikers
Either ship it to the guy above me, or keep it 'cause it's cool. This is the kinda stuff we all should WANT in our tanks. That little guy probably couldn't eat caulerpa faster than you grow it if his life depended on it. High odds you wouldn't notice much change in growth.
I should have searched for threads before posting a new one.
I recently decided to get back into salt water and started with a tank of mostly caulerpa, live sand and dead live rock from my old reef tanks. 2 weeks ago, I started to see what I believe are Oxynoe antillarum slugs. Now they are everywhere and breeding out of control, leaving spiral shaped egg masses everywhere. I can also see a lot of damage to the caulerpa algae. It’s a small tank, and I’m worried it will be overrun.
Any natural predators for these?
I’m inclined o start all over with another tank so I don’t have these infest my algae again. It would be okay if they didn’t lay so many eggs. I a month, there will be thousands of them at this rate. The biological load I will be a problem, not to mention all he dead slugs releasing their defensive toxins over time.
Any thoughts?
I recently decided to get back into salt water and started with a tank of mostly caulerpa, live sand and dead live rock from my old reef tanks. 2 weeks ago, I started to see what I believe are Oxynoe antillarum slugs. Now they are everywhere and breeding out of control, leaving spiral shaped egg masses everywhere. I can also see a lot of damage to the caulerpa algae. It’s a small tank, and I’m worried it will be overrun.
Any natural predators for these?
I’m inclined o start all over with another tank so I don’t have these infest my algae again. It would be okay if they didn’t lay so many eggs. I a month, there will be thousands of them at this rate. The biological load I will be a problem, not to mention all he dead slugs releasing their defensive toxins over time.
Any thoughts?
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Get a wrasse if the tanks big enough...
That’s not a bad idea, provided they’ll eat them; maybe a 6-line wrasse since they’re small. I don’t want to wipe them out of the tank they are in, but there’s lots of stuff I want to transfer to new tanks at some point. I could have the wrasse patrol the transferred items the eliminate stray slugs.
Oxynoe species emit a toxic cloud of fish deterrent when harassed, so the wrasse may not be the solution.
Thanks for suggestion
Oxynoe species emit a toxic cloud of fish deterrent when harassed, so the wrasse may not be the solution.
Thanks for suggestion
cristata.reef
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You could sell them. I know @Kamden Uelton loves them
Hmm...
Careful what you ask for. They’ve just about destroyed all the green caulerpa starters I had going, and the tank “was” choked. I’ve counted over 100 egg masses and at last 59 slugs from the front of the tanks; they’re are probably as many against the back.
I expect the best I can do is start over in another tank and hope no eggs slipped through.... i posed picks in this thread :
https://www.reef2reef.com/threads/tank-overrun-with-oxynoe-antillarum.494978/#post-5313133
I guess if someone wants to trade any for other reef organisms I’d be happy to discuss.. I’ve just started to do salt again (after giving up 10 years ago) and am still establishing tanks. I never imagined this would happen...
Careful what you ask for. They’ve just about destroyed all the green caulerpa starters I had going, and the tank “was” choked. I’ve counted over 100 egg masses and at last 59 slugs from the front of the tanks; they’re are probably as many against the back.
I expect the best I can do is start over in another tank and hope no eggs slipped through.... i posed picks in this thread :
https://www.reef2reef.com/threads/tank-overrun-with-oxynoe-antillarum.494978/#post-5313133
I guess if someone wants to trade any for other reef organisms I’d be happy to discuss.. I’ve just started to do salt again (after giving up 10 years ago) and am still establishing tanks. I never imagined this would happen...
cristata.reef
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Oh he knows that. He keeps nudibranchs and crinoids (kinda crazy but no judgement here lol). Most of his stuff is designed to house specific species anyways, I doubt he'll mind
