Very carefully hehehe the only mixes i do is Predator Tanganyika with Predator Malawi Haps they tend to stay around the same size and aggression levels, for example i have right now and soon to have together..
Tanganyika Nkambe, Lemarii, Tetracanthus and Malawi Exocochormis Argeny and Nimbochormis Fusco big torpedo shaped cichlids..