Well Joea is right, in theory they can all mix up, but in practice it is not likely.
Cichlids with different coloration almost never mix, they will mix only if a female don't have any male and if male have no females in his domain.
The best way to avoid this is, as mentioned, to have enough females (2+) for one male.
I spend some time on cichlid forums all around the world and I don't understand when people have 1 or 2, max 3 cichlids of one species…it seems that they don't care about the "Mbuna needs" if I can use this expression they only care to have a variety of shapes and colors in their aq.
I don't say that it is the case with respectable bcb680 but I just had to mention this… :wink: