I want buff pheasant and black pheasants

I have a 16 by 20 foot pen with 14 bob white quail,and 4 ring necked pheasants dose and body think I could put a pair of buff pheasants and black pheasants I like the colors of the black and buff and with my business they should be a good seller but I have a sliver ring neck pheasants rooster and three normal hens while actually the rooster is just much lighter color but could I also put two more rooster in thre I have enough food and cover but wold they fight or pick please comet