I have a 24 gal with an anemone in it, he is doing well, but when i first got him it was a complete nightmare, they move around ALOT to find that perfect spot, it took mine 3 weeks and a severe injury to finally find where he wanted to be, I had to do so much moving of my corals, polyps, mushrooms and zoos, I was moving around my tank every few hours because of him, not to mention dealing with the massive injury he inflicted on himself trying to fit in a terrible spot, all in all, If i had to do it all over again, I would not, good luck in your decision