Have you thought about south American cichlids rather than Africans? They might do better if your tap is ascidic to neutral- mines neutral. What ph is your water?
In gen they are more easy going in temperment and you could keep some real intresting species in a tank like that. Keyholes, sveriums, Angels, ( Urus- they might get too large). discus, jack dumpsteys, rams, - Note these fish are choices NOT compattable tank mates, rams are small and like peaceful cichlids/fish tankmatyes while a jack dumpsety would do better with more tough fish.. I highly recomend wet web media, email them about your tank livestock questions.