There are 8 species of heniochus butterfly fish and all of them vary in term of their hardiness and risk with corals. The schooling bannerfish, H. Diphreatus is probably the one you want. It looks virtually identical to H. Acuminatus so make sure you can get a positive ID on the fish you buy. Do a thread search and I am sure you will see many previously answered questions on how to tell the difference.
