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I think. I have a slug. Is there such a thing? It is like a lime green color with a white bottom. and moves like a common slug. I can try to post a pick, but I wont be able to untill tomorrow.
Yep, do a search on sea slugs or nudibranches. Without a pic I would venture a guess at Tridachia crispata or lettuce nudibranch...but this is a total guess...