The number of fish to put in the tank must be determined by the types of African Cichlids that you are going to put into the tank and the amount of Rockwork territories that you provide. Since you said you are new to african cichlids I would imagine that you are going to start with The Lake malawi Cichlids. These can be divided into three main groups. Mbuna Which are the more agressive Rock dwelling cichlids and the most commonly available. These are best kept in a tank that would be considered very crowded. Species should be kept in groups of around 5. Some of the more common of these are the Zebras and the Yellow Labidochromis, as well as melanochromis Auratus and Johanni. The next major group would be the Utaka Which consists primarily of the Haplochromine cichlids. These are for the most part less agressive and should not be kept with the more agressive types of Mbuna. The Haplochromine Cichlids are usually found in areas of open water not far from rocky reefs and shores. They are some of the better colored fish in the lake. Some of these species get quite large and are best kept in groups of 4 or less. Try to get 1 male and the rest females of these species. Some of the more common Haplochrimine cichlids in the hobby are. Copadichromis Borleyi, Protomelas Steveni, Protomelas Fenestras( the Red Empress ), Nimbochromis Venestus. The third group I would consider for the aquarium and by far the most popular for their color and peacefull temperment are the Peacocks of the Genus Aulonocara. These fish are mainly cave dwelling sand sifting feeders. They will freely hybridize so it is best to keep only one species per aquarium. However Males of different species may be kept together without females in the aquarium. Without going on and on I would recommend that you get some books about these fish. I would start with a book called Sucess with Cichlids from Lakes malawi and Tanganika by Sabine Melke and also there is a very good book about the care and breeding of these fish written by Mary Sweeney. I believe it is called The proper care of Malawi Cichlids. I would start my tank out with 6 yellow Labidochromis from a reputable source so as to avoid hybrids. Because these fish although part of the more agressive Mbuna are quite mellow towards other species. While enjoying these fish I would do a little reading and research to decide what other species I would put with them. DO NOT FORGET TO QUARANTINE NEW FISH BEFORE ADDING THEM TO YOUR MAIN TANK!!!!!!!!!!!!!