I am starting my first african tank. It is a 55 gallon tank with crushed coral and dolomite for the substrate. I have several large rock formations, some texas holey rock, clay pots, and a brick in it. The tank has been running for over a year and is fully cycled, I just converted it to meet the need of the african cichlids. The pH of the water is naturally high so I have no worries there. Right now the tank contains 2- Johanni, 2- Zebras, 2- Auratus, 1- socolofi (might be spell ed wrong, I always the the sylables wrong in that one), and 1- Perlmutt. All of these fish are only 1-2 inches in length. I am having no problem with any of the fish being over aggressive. Does anyone have any suggestions on what other types of mbunas I could add? I was thinking that a pair of electric yellows would look nice.