I currently have a four-five inch Clown Trigger which I really enjoy. His/her only current tank mate is a comparable sized Banner fish. I didn’t originally want to add any other triggerfish. However, I have been contemplating adding a Bursa Trigger into the mix. The particular fish that I have had my eye on is roughly the same size as my clown and is in good health. Currently, the three would be sharing a 90 gallon tank but would move into a 220 by the end of the summer. I have excellent water filtration, via: an over-sized wet/dry, UV, and very efficient protein skimmer. Is this a bad idea in a 90 gallon? Would the 220 even be enough room? What would make other good additions outside the trigger family? Thank you very much for you time and expertise!