Hi folks- I'm getting a 55 gallon set up. I know for sure that I will be moving one male and one female angel I've had in a 29 gallon for more than a year into the bigger tank. They've outgrown that 29 and need a bigger space. I really would like to put a severum or firemouth in the 55 gallon with them. What are your thoughts? Has anyone tried mixing these species? Would I be totally insane to try to mix all three? I had a severum as a kid, and he was a pretty gentle giant. I would love to hear your stories.