usually, with a female, they have much less bright vertical red barring and the pelvics are clear. That pic doens't have the dorsal extended, but I would bet it mirrors the male behind it, while with females its often less prominent (shorter than the males). Also, anecdotally, the females tend to move very differently than the males. The males tend to do short bursts, extending the pectorals while the females are more "graceful".
I have shipped live food cultures but don't have any available right now.