Over the years, I've had/tried a variety of dwarf angel's. Ultimately each one had/acquired a taste for something in my tank. The last one, a Flame Angel, didn't touch any of my corals(LPS/SPS), but had a taste for clam mantle. So, I think they are very hit or miss.
The only Angelfish I've never had a problem with are the: Watanabei and
Lamarck's.