I wouldn't mix black and white for several reasons...
In truth you will not be able to tell the difference once they are in the tank. There will be a hierarchy among them and some will become black and the others will be gray, white, dark gray etc.... They will also cross. If you ever need to git rid of these fish you will not be able to sell them as you don't what they are.
Stick with one type.... and do TONS of them.... it's a 150 so I would suggest about 20 . For this to work you need A LOT of them. Other wise, what will happen is the dominant male, one by one, will start to pick on the next dominant male.
Peacocks will work but since it's such a tall tank I think I'd go with Cyprichromis or Paracyprichromis.
I hope that all made sense.... a lil outta it ! :lol: