No problems with the leporinus and nipping? I like the look of them but I've heard horror stories about their aggression...that's what's scaring me off of leps and black sharks.
He has an occasional spout with the convict but, other than that he's fine. He doesn't pick on any fish that don't bother him. I've heard horror stories about CAEs as well, but no experience proof of it.
I'm thinking of changing the substrate in my main tank too. Isn't it bad for the fish to swim in the cloudy water like that? Or does that only count if it's left for longer than necessary?