I don't have the experience yet of many here but I keep my 7 adult Nourissati in a 500 gallon tank with plenty other Paretroplus (menarambo, dambabe, maculatus, kieneri) and 2 pairs of Ptychochromis "gold". There are 2 pairs that have spawned. Not sure if the others are all males or females. Aggression is rarely seen with them but they certainly chase each other and the other cichlids around every so often.
My problem has been the same as the other keepers, they eat the eggs after 24 hours. I managed to take 1 clutch out but it fungused quickly despite my efforts to prevent this. So I am still waiting to be a grandpa as well, with no luck.