I have had my cowfish for a couple of months now, and I swear he is the guardian of what corals I do have. He goes from one to the next and just hovers over each one for about 15-20 min and then goes to the next one. It really is funny to watch. Maybe he is just trying to decide which one he wants to eat. But he has never touched any of mine. And I am about to stock up on some acros when my lights get in. I would spend the money on these corals if I thought differently. Just my .02