I would go with some electric yellows and some dwarf mbuna like the cynotilapia afra\ hai reefs or something along those lines. Mabye kenyis or socolofis, but they are all aggressive types so it's good too overstock a bit as long as your filtation is good enough. You also want to have more acai I think they do better in groups but some mbunas do terrible when you have 2 males of the same type and they will fight constantly so be careful of that, an all male mbuna tank is very unlikely to work so I have heard so you should try for one male and a few females of each.