I have a forty gallon tank and was hoping to start a mbuna tank. I live in the sticks of northern wisconsin so the fish store doesnt really handle many fish. Mostly mbuna. So I was thinking about an electric blue johanni, a cobalt blue, and maybe another cichlid that is equally aggressive. Is the tank to small for three or two of these cichlids? I know johanni and cobalt only exceed five inches right? can i get some ideas, please keep in mind Im really limited on selection and would like to stick with the mbuna family.