We all know how difficult it is to identify the sex of these fish, so please post a picture in here and we'll try to help you (or at least give an educated guess!).
I thought I'd let the pros have a go at sexing these The first three may be too small at 1.75", but it's worth a try anyway. The others are, 2.25", 2.25" and 2.5" respectively.
Thanks for the help Rob I was pretty stumped with these guys because of the lack of interopercular odontal growth, I'm not too hot at just using body/fin shape for IDing yet. Nevertheless, it's good to hear that there's possibly a nice ratio in this group.