Is it a tank raised clown? I have a wild percula, and a wild tomato, that behave normally. I can't say all but most tank raised (that I have seen) behave a little odd. That is only my humble opinion. You could try feeding only at the lower levels of the tank by using hard airline 1/2" tubing and dipping it in tank and droping pellet food in it. If you only feed it a lower level, maybe it will change behavior. I hope that helps, and welcome to reef frontiers