i have some experience on this fish.
it isn't in the dwarf angel genus or any of the full-size angel genera. it is in the Chaetodontoplus genus. still an angel because of the spine on the operculum, but it looks and behaves more like a butterfly. not very aggressive as far as angels go. i've kept a couple with some softies such as: toadstool leathers, mushrooms, and zoas. i've never done it with hard corals however. i wouldn't be suprised to see it nip at lps and sps.