From Seriously Fish
"Mature females are noticeably rounder-bellied and often a little larger than males. Males are generally more attractive with dominant individuals often displaying intense colouration."
http://www.seriouslyfish.com/profile...cies=brigittae
My CPDs the males almost glow the reds get so intense. I don't have Chili Rasboras yet, but club members' fish get really nice color. They feed live and frozen, not just flake or pellet.
I feed frozen BBS and my Rainbows and CPDs display like crazy afterwards