I have many different tangs in my 300 gallon reef and they are many years old. I guess I am one of the tang police as I sure have answered a lot of posts about why tangs fight or catch ich and die. I have a Kole tang and he is as active a swimmer as the yellows, sail fins and hippo's are. I love them, but really feel that minimum tank sizing isn't always the best deal for the fish. When tangs stress, they become breeding grounds for other parasites. Your coral beauty (have a 12 year old one) is a okay choice, even in a reef. Fish only is no problems at all for any of the dwarf angels for your tank size. The lion fish is a VERY cool fish, but will eat anything up to 1/4 of his size, or better. JIMO