gender/breeding?

[AnthonyS]

hello, I'm new here!!
I started out with 4 RCS shrimp and I got 3 developed female and 1 juvenile female. I just bought 8 more and 5-6 of them have all the female features (bigger abdomen, saddle, etc.), but then I come across 2-3 that have male and female features ( a small saddle or what seems to be a saddle, but the abdomen doesn't cover the swimmeret). The problem is i can't tell by color because the new 8 are a low grade RCS/ snowballs. my question is how can you tell if they are male?

P.S: some have shed and no signs of breeding, so are they all female?

thanks

[Mustafa]

Only pictures can help us tell you if you have some males. Plus...RCS and snowballs are two different species, not interchangeable.