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I am buying a 55 gallon aquarium and it's coming with a Blue JohannI and a Livingston cichlid. I know the Livingston shouldn't really be in a 55 but that's beyond my control at the moment. I would like to turn this into an Mbuna tank. I've heard that keeping the tank overstocked helps with aggression but I do not want to add too many fish at once and overload the system. Any advice on what to do in this situation? How many Mbunas should I put in the tank? Any general advice is welcome since I am new to cichlids.