I have an 8" red devil that I will be moving into a 90 gallon in the next week. He has been pretty rough with pretty much anything. He currently is in a 55 gallon. I tried putting a couple 3-4" convicts with him... Beat em up! Plecos... Beat em up! Any chance in this 90 of any other roomies?... I'm guessing this guys is a solo fish. Please let me know your thoughts. Thanks!