African cichlids can live with each other, but not because they are not aggressive. On the contrary, they are one of the more aggressive varieties of cichlids. Mbunas are smaller than other cichlids, but they are more aggressive. As such because of their size, they do not pose a threat to larger
cichlids, such as Peacocks and Hap cichlids. And if you can reduce the aggressiveness of each cichlid, the better. Putting different colors of cichlids will make them less prone to aggression and conflict.