African cichlids, or rift lake cichlids, orginating from lake malawi and the T lake I cant spell can range from anywhere to being really pasive happy like a Yellow lab to being horribly mean like say an auratus and johanni. If you want somthing really easy to keep and not so agressive i would not go with mbuna, these are fish from lake malawi and are quite the nasty little buggers. I have a 55g tank of them and they just cahse each other all day. If you want more pasive go with either haps or peacocks, they are smaller and less agressive and more often than not come in a multitude of colours when the mbuna are usually morphs of red yellow or blue and ussually solid or striped ( with the exception of johanni and aratus, which i think are just magnificent in colour, but are the most agressive in my opinion). If you could tell me what agression you want in a tank i can tell you what you what u can have and how many most likely. Me i personally like the mbuna because they are fiesty and are sleek and powerful, yet will not bust your wallet, like some peacocks will or haps will, and they are relitively easy to keep and breed.