And yet, not too many months ago, there was a thread started here that concerned, guess what?, Genicanthus (I think either bellas or lamarcki) angels nipping and even killing coral. No Angel, no FISH period can be considered 100% reefsafe. Its a guarantee that is meaningless..
Oh well, anyway the OP asked about dwarf angels, not Genicanthus sps. I do agree, those are safer than Centropyge. As far as that goes.. LOL
You place your bets, you takes your chances..
As with everything in life.
Sincerely,
Matthew