Albert, unfortunately H. diphreutus also occurs in the South Pacific, Indian Ocean and Red Sea. H. acuminatus does have a wider range but occurs in some of the same areas as H. diphreutus, including Hawaii. 
Doo-E, as stated, H. diphreutus seems to have a better reputation, but of course there are no guarantees. I expect you mean dwarf angel (Centropyge spp.), not dwarf butterfly.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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