The choclate isn't with the black nasty, size differences apart the choc is too mellow to be with a super aggressive fish like that. I originally got the black nasty as a resuce type thing- that fish was really torn up- but its making a good recovery now. Im hoping to possibly trade it to someone in the NE Kansas area for a Vieja of a sort or just re-home it to someone that can breed 'em lol.