I have a 6" or 7" albino chocolate in my 55g with my cichlids, and at work/LFS someone dropped off a 13" common who I couldn't pass up. So far the two seem fine together, I'm just trying to make sure they're wont be any problems in the future. Any opinions or advice would be appreciated. If its a no go, the new guy will just have to go in the 90g.