Large and small. Centropyge,Paracentropyge,Chaetodontoplus,Holocantus,Pomacanthus and Pygopilites are all treacherous to varius coral species. Genicanthus(Lamarks, Japanese swallow tail,etc) are less dangerous to corals since they live in deeper areas of the reef and do not have coral on their usual diet. However, I've seen my Genicantus melanospilos( Japanise swallow tail) nip trachyphylia and cynarina , frequently..