All Males--OK. Now you need to do your research and find which Peacocks and/or Haps you want. Lots of peaple mix hap and peacock males. Not all of them will mix, and what works for one person, may not work for you. Try not to get 2 males that look alike, they will fight. Some peacocks are more meaner then others, but in general they are peaceful. It will take a long while before you get a "Harmonious" tank. There will be a lot of trial and error. One fish maybe just fine for about 6 months or a year and then decide that it's neighbor is it's enemy, or become a phyco want to kill others. Trust me, this will happen.
Try and fine the one fish that you MUST-HAVE, then try and build around it.
Good Luck. Do lots of research.