To be honest, every camera in my possession is HORRIBLE at trying to capture anything in my tanks smh. I have a 5g, and was told that I was purchasing 2 males & 2 females. The previous dominant male arrived dead, so the current one now took over. They were juvies back then, though. I hoped I had 1 male and 2 females, buuuut that's definitely out the window now. Your males probably have enough space to establish multiple territories since they're able to color up so nicely. Probably not enough space in my 5g for two different territories =/
The fish in question looks the exact same as a male, but white/pink with no fin coloration. I see your female has more of a grey/green tint to her dorsal/back area, and has a pretty broad stomach area, almost like a mini silver dollar fish. That alone makes me think it's just a male on the lower end of the hierarchy. I'll try to post pics of the fish later today, though. Thanks for the help, btw!