Hey, I just put a rock with zoanthids on it in my aquarium. Next thing I know the dotty is pecking at it like crazy. Doesn't touch any other corals at all. Could it be that I stuck the rock in his territory or something?
It's possible, my clowns would constantly flip my chalices over if I put them near their mushroom. Another possibility is that the rock came with some pests or pods on it and the fish is just getting his dinner.