If by columbian catfish you mean hexanematichthys seemanni, then no, they need a brackish environment, the cichlids would probably pick on them, and conversely, their mouths look large enough to eat any unwary mbuna. http/www.thetropicaltank.co.uk/Fishindx/sharkcat.htm
i fear the columbian cat would make short work of these. they will eat anything the can get in their mouths. as state they get large and need big tanks too. and they are without doubt Brackish, which poses the most difficalt problem, Mbunas arn't.