I put 3 in my 125 gallon which had a small amount of aptasia maybe 10 in total, with in a week it was all gone. Now Im having problems with some of my zoa's and button polps coming up missing, at least 20 heads of stuff so far. Is this something they will start to eat, I havent giving them anything to eat. What do I feed these guys, please any help I could use. Or could it be some of the hermit crabs I have that is doing all this. I have no fish in my tank.