i just had a pocilipora go nuts and almost all the tissue came off and all the polyps are gone. I dont know what happened. Nothing else in my tank was effected either. My other really small frag of it wasnt affected though. My other corals are: orange ricordia yuma, orange montipora digitata, brown montipora digitata, orange montipora capricornus, purple montipora capricornus, pink acropora millepora, green seamat.