What kind of rainbowfish are these?

(Sorry the top one is a little out of focus) The LFS said they were "neon rainbowfish" but they're too big to be praecox...plus they look completely different from each other. They also said the big yellowish one is a female (who knows?).



They said the smaller striped one (far left, only got part of the fish in this shot) was a turquoise rainbowfish but I'm not sure about that, either.

Also, do the gills on the bigger yellowish one look unusually red to anyone? In 'real life' it doesn't look as red as in this photograph but sometimes the camera picks up stuff that would normally go unnoticed. (Tank parameters are ammonia 0, nitrite 0, nitrate 10, pH 7.2, KH 40, GH 120, temperature 79).

The fins are clear with the faintest, faintest hint of pink.

I was told they were young fish and they would become more colorful as they got older. I was also told the largest yellow one was a female (which means she probably won't get more colorful).