Lake Tanganyika is the deepest lake in Africa, and holds a very different assemblage of species to both Lake Malawi and Lake Victoria. There are many sub-groups of fish in this lake, all with different behaviour, environments and overall appearance. Tanganyikan cichlids also need hard, alkaline water with a pH around 8.0. They are usually must less aggressive and do not need to be overcrowded. However, they are not suitable for keeping in a community tank, and should not be mixed with the more boisterous Malawi's and Victorian's. Many species are small, so they can easily be kept in very small tanks, providing the water is kept free of pollution.