[Chin_Lee]

The fact that you need to ask this question tells me that you already know the answer but looking for the exceptions to the rule to reassure yourself that they could possibly be reefsafe in order to justify buying one to put into your reef tank. Don't worry - many of us do the same thing when we really want a non-reefsafe fish.
The truth of the matter is, even some fishes that are considered reefsafe are not 100% reef-safe. A friend of mine has regal tangs that are eating his xenias and softy corals. I once had a rabbit fish that ate rics and zoos. I currently have a lamark angel in my lps reef tank that likes to nip at the frogspawns and brains. ALL those fishes are considered reefsafe but these are examples that contradict the general "reef-safe" classification of these fishes.
So when asking this question if these angels are reefsafe, we seek reassurances from those who have these fishes that contradict their "non reef-safe " classification. But regardless how many people have angels in their reef that are behaving nicely, the only one that really matters is the one that you do buy.
My only advice is to put your new fish into QT tank and put frags of your different corals into the QT tank for observation. Don't feed the fish for a day or so to see if it will resort to the corals as a source of food. If it doesn't, then introduce into your reef tank and pray.