Be careful with angels, even pygmy angels, in a reef system. They tend to nip at corals, mainly softies and lps. From your other posts, I believe these to be the corals that you work with. Can't believe noone else mentioned this. You guys are slippin...J/K. Beautiful fish, but I have found some of the most beautiful can be some of the most tragic fish to add to a reef. Even though these guys are most of the times more subdued than many other angels, I've heard some horror stories along the way. Just watch him for personality quirks. If he starts messing with your corals, move him out. Just a word of precaution...