I also had one in a 180 mixed reef. No issues with corals, but my clowns tried to harass it initially (angel finally asserted itself and all was well). Took it a bit to start eating prepared food, although it was always picking at the rocks & substrate. Once it started eating, it did great (until a tragic electrical issue claimed its life). It was in with an (almost) adult emperor and I had no problems. I think they are one of the most beautiful fish, and with the impending possible regulations in Hawaii they may soon be in shorter supply than they are now. Keep in mind that all fish are individuals and your experience may vary.