I wouldn't because they can hybridize. I'd choose one type (black or white or comp) and put in six juvies. Once a pair forms, you can remove the others. Often the dominant male will not tolerate other males in "his" tank.
I had five WC Kipili Comps 2m/3f and four WC Fire fin 2m/2f comps in a 7 foot tank and had no problems. they were not breeding so i moved them to smaller tanks by themselves. I was also worried of cross breeding.