Very nice pickup off of DD, I saw them and loved them. I currently have a single flameback in my 30g with mix of sps, lps, and zoas and so far so good. He picks a bit at my one gorgonian but other than that he is ok. I believe they are one of the more reef safe dwarf angels (if there is a thing). They are known to be pretty aggressive so they should hold their own against bigger fish, just be careful if you have smaller fish, they can pick on them.