best thing you could do is get more fish than you actually need, because if you overcrowd africans they are a lot less aggressive. I have a 60 gallon full of africans that's been set up about 8 months and the fish are all around 4" 5 at the most. they don't tend to grow that fast compared to say american cichlids. so if you say 10 fish in a 55g, the fish would become aggressive asserting for the territories that you do have, either have lots and lots of different caves and areas or have more fish than you want in the end, and just downsize your stock when they get bigger.
There are lots of africans you can have in your tank and lots of options just do some research and let us know what kinds of fish you like and we can help set up a stocking for your tank!
good luck
There are lots of africans you can have in your tank and lots of options just do some research and let us know what kinds of fish you like and we can help set up a stocking for your tank!
good luck