They can host them, in fact the one that I was going to buy was already hosted by some type of clown fish at the pet store but I decided not to buy the condy without buying the fish since it was already hosted. Don't want to be taking fishies houses. I do know that it is not very likely but I seen my clown go towards it and through it then 5 minutes later the condy was all inside of itself and balled up like they do when scared. I am also starting a 1 gallon pico with sand that I had left over and im going to buy a 5 lb piece of liverock, 2 inch sand bed.Clowns don't host condys unfortunately. They are more likely to be eaten by one than host it. lol