With any species you can get a rogue male, and a male that may take over the tank. I think the ones to watch would be the maingano and hongi. Labidochromis so. “mbamba bay” might be a quieter option.
Other fish to consider in the mix are Taiwan reefs, red empress, kadango, mirror balls, white lips, blue dolphins, electric blue.
You could start with 30 fish (once your filter is up for it) and possibly get 2 males of each peacock to increase the chances of colouring up nicely.
Sounds like a great tank. You’ll have to post pictures