the bellus, swallowtail, lamarck, zebra, and watanabe, are 99.9% reef safe. After that the cherub, resplendent, fishers, whitetailed, multibarred, and flamebacks are usually reef safe.(the first 2 and last 1 can be a little aggressive) flame, golden, potters, and multicolor, are also less risky. All the others are 50/50 or below. it also says that angels kept in larger tanks and well fed are less likely to damage coral. I got this info from a article by Scott W. Micheal in aquarium fish magazine.