So I got a 40"l x 16"d x 18" h tank. I've got my heart set on keeping some Cynotilapia sp hara white tops. I was thinking either have this as a species only tank or also adding some saulosi? Would either option work? I have another 48" mbuna tank that's been set up around a year so I'm not totally new to mbuna and I have several Tanganyikan tanks and been keeping tangs on and off for 24 years.