I have no idea on which Africans are which because usually they are in a tank all together. I don't know which species I can have. If you guys would be so kind to post a picture of each African that would be compatible it would make it solo much easierAgree OB zebra (Metriaclima estherae OB). So you want 1m:4f of those and then choose 2 more mbuna species that are not Metriaclima and not yellow or orange. Avoid stocking yellow labs with estherae.
I'd avoid acei and johannii for a 55G, they are better in a 75G or larger.