Trade them in at lps for something else. Your dominant male will not allow your sub domaninant males to colour up. But I would keep at least one to keep the colour always strong in the dominant male and give him something to fight (chase), and sparing the females a bit. That and if anything happens to the coloured male you have a replacement. That and most stores will trade males for females as it is easier to sell males.
Hope this helps, good luck