African cichlid's native habitat has higher ph, kh, and gh than most tap water provides. The cichlid salts sold at LFS have three ingredients: Baking soda, which raises kh and ph. Epsom salt, which raises gh. Sea salts, which raises ph and adds trace elements. Whether or not this is necessary is still in debate. I prefer to try and make the aquarium water match their native water conditions. Will they survive without adding these? Probably, but I notice when I make the water conditions the same as their native lake, they seem to be more active and colorful.
If, however, your tap water is close to what their native lake provides, I wouldn't add anything. Confused yet? So am I. LOL