South American Cichlids • Cacatuoides sexing help

[GanonCichlids]

http://imgur.com/gallery/xF48aK3

I know the big one is for sure a male, but is the 'female' actually a female? I've looked at references but I cannot tell for sure.

[sir_keith]

The second fish looks like a young male to me.

There have always been way more A. cacatuoides males than females in the hobby, no doubt because most breeders keep their breeding stock at temperatures above 27°C, which encourages breeding but results in a heavily male-biased sex ratio. When I was keeping these fishes, years ago, I was careful to keep the temperature of all the breeding tanks below 24°C.