Originally Posted by Threed240
They eat Zoa's too. I found 3 on a cluster of Zoas I had bought, munching down. So I sent them for a ride through my pump, and then down a drain that does not lead to the ocean. They are very poisonus.
No, they are different species. Although they look similar, one eats Zoa's and one eats Aiptasia. I'm not saying for sure the one in the pic is the right one but it would've been worth investigating before removing it. Almost all Nudibranch's are specialized feeders, feeding on one particular thing and that thing only, I guess that's why they are so hard to keep in an aquarium. But then again, better safe then sorry.