I've looking around and did a lil research on them and they seem like to be a bullet proof way to get aiptasia out of the tank. My only concern is that I also read that some shrimps namely peppermints will attack and eat them. I do have one creeping in a cave so if I have to I'll get him out one way or another. Another thing thats concerning is some of the more cryptic fish I have eating them. Would I have to worry about this? the only ones I worry about the most are the swissguard basslets, pink streak wrasse, yasha goby or pistol shrimp. I don't think any of the other guys would mess with the nudibranches except them. Anyone got any experience with them and lost them like that?