So I just joined this forum and I have a few questions, i have a 75 gallon fish only saltwater tank, I have an emperor 400 with established bio- wheels and a fluval 306 canister filter along with an eshopps hang on back protein skimmer, the tank has been up for almost a year now. I use ro water and test water parameters three times a week with a 20 gallon water change every week along with cleaning the filters. I was wondering if you guys new of any good butterfly fish or small angel fish that I could add to my tank. I have live rock along with some decorations. But my main concern is I want the new fish to get along with the fish I have in the tank. This is my first saltwater tank so I would like one that doesn't require special care. The fish I have in the tank now are as follows: 1 diamond watchman goby, 2 goby fire fish , 1 purple dotty back, 1 algae Benny, 1 yellow eyed kole tang, 3 blue damsels females, and 5 blue/ green reef chromis. I'm looking for suggestions?