I have serpent starfish in my tanks, they hide a lot, but can easily be coax out with something meaty, very neat to watch. Even when i put pellets in, I can see the tiger one brings its arms out from the rock crevices and try to grab some. I did take the chance in my biocube with a CC Starfish, knowing that it may munch on my coral. If it has, I haven't noticed. That being said I dont' think I'd risk one in my other tank.