Well.... you may not believe this, I had a melanochromis auratus, also male, and it was about 3 inches at the time... he was givving my little labs absolute hell, so i netted him and rested the net in the corner of another tank (community with a golden gourami , some dainos, etc.) and he jumped out into the tank and was the most peaceful fish I had ever seen ...Insane I know....maybe he hit his head on the way down and thought he was a danio..... anyway he didn't even show any agression to any of the other fish, so I left him there.... he just died recently, but it was the craziest thing i have ever experienced in fish keeping.....
as for africans though, these fish can be nasty.... I wouldn't ever buy another for a african tank unless I had TONS of room because they want everything in thier sight dead it seems......