It sounds like you have 2F/1M, but be aware that they do better (and are more likely to spawn) in larger groups. I never saw a red line up the back of any and had regular, green, and albinos.
The red line I got from a website that I was reading trying to identify their sex... I know they do better in larger groups... I only use to have the one.. (he was the only friend my bala would allow) when the bala died I went and got him two mates (they are **** hard to find around here!) and came home to find my neighbour had thrown their mollies in to my tank! The what i believe is male has the run of the whole tank.. the mollies kind of ignore him.. but the other two barbs just hide from him and you never see them. I was hoping they would all school up nicely and was going to get more (if i found them and if i decided my tank could stock more)