It's around half the size you need for most Africans unfortunately, certainly too small for Mbuna. The only viable options would be some shelldwellers from Lake Tanganyika or a pair of Kribensis.
Mbuna really require a 4 foot 55 gal tank as a minimum and Haps require something larger again.
Check that out too. There are other Tanganyika cichlids that may also work, depending on dimesions. There's a bit to choose from. That site also lists some SA fish as well