Please help me sexing this fishes

[anubeast]

This are all fishes that I still decided whether to buy it or not? all are around 3 inches. The picture I take I focus on bottom of the fish because I wanna proof theory of sexing by anus whether it possible or not? Please help me. If possible please tell me method you use to decide which one is male or female.

first one


second


third


forth


thank you very much

[anubeast]

so nobody help me? only one post with nothing useful.

[TwoTankAmin]

Only one of your pictures is clear/detailed enough for me to even want to try sexing from and that is for fish #1 which looks to be a male. I might guess at #3 being female but i would not bet on it.