My clowns move from one area of the tank to another, irritating the hell out of my corals as they go. They recently picked at my toadstools base, cleaning it to spawn, until the thing tipped over. So I made that inaccessable and now theyre hosting an unhappy frogspawn.
Basically clowns hosting any LPS is bad for the coral, especially frogspawns, torches, and hammers, because of their sharp skeleton and fragile flesh. It also depends on how rough the clown is with the coral, somstimes its fine. But if they host goniopora and it doesnt extend to eat, its in trouble. Id say move the coral, put it on the other side of the tank, they probably wont follow it. If they do, move a few things around, eventually theyll leave it alone.