Ok, I think one is male and one is female.
I can't get a good pic right now because one is a little stressed out so the colors are faded... (they are both being treated for a bacterial infection, and whenever I add meds to the the tanks, he loses his colors for a short time...)
But one I think is male because he doesn't have any black on his pelvic fins which they say is a common female trait, and he's slightly larger than the one that I think is a girl (because she does have black on her pelvic fins.)
as for one having a pink belly... I don't see it on either, but if it's faint, I probably won't see it. I'm blind in one eye and sometimes red can look orange, or a very faint pink will look white to me.
but I think one is male and the other is female.