ime-
all dwarf angels, are, at the best, a 50/50 crap shoot
coral beauties have the least likelihood of eating corals-but the chance still exists
the dwarf angel group, is, for a large part, pickers and grazers, and they appreciate a nice amount of vegetable matter in their diet
most of the coral eating issues seem to start almost by 'accident'-the angel picks at a polyp, while doing it's normal 'picking and grazing' thing, accidentaly gets a polyp,and if it decides that it likes the taste-the problem begins
fwiw-i had a coral beauty for about 4 yrs.,and i never had a problem w/it, and, to the best of my knowledge, the friend i gave it to when i broke the tank down had no problems w/it, either
i have had plenty of customers who have had problems with it, though-
it may have been due to lack of a varied diet offered the angel, or the lack of algaes for it to graze on