I would skip the nasuta and the dimidiochromis in a 75G. If you do tropheus go with a species tank.




I was actually a little surprised and disappointed by your issues with Victorians. They have always been a favorite of mine and one day I want to keep a zebra obliquidens tank. I have kept single males in the past and they colored up really nicely.
The Obliques will work very well, not sure about lots of multiple males. I have also kept Nyererei and Neochromis omnicaeruleus in species tanks, aggressive but beautiful.
I think Dr. Exum chose aggressive species and mixed them and not enough females.
