Neon Dottyback is in reef and has never nipped at coral or clams. I have LPS, SPS, and softies in the tank. He will nip at new fish additions that are his size or smaller (doesn't bother any that were there before him).
Majestic Angel is in the FOWLR. This species is not considered reef safe and I have not observed him around any coral so I would make no representations.