I have three tanks my 54 gal has a flame angel, coral beauty, and a bicolor. Tank has been up and running for about 8 years now fish have been in there for no less than 3 of those years. 180 gal has a flame angel, coral beauty, bi color, eilbli, flameback, and keyhole angel, all getting along flawlessly, tank has been established over 15 years and occupants have been in there no less than 8 years. You can put pygmy angels together. I have been doing it for years.