First four are supposed female, last two are supposed male, based on physical differences around the vent and tail length/thickness. Haven't popped them yet. First time with garters and these guys are so active, I was a little worried to try before handling them a little more to get a better feel for them.

The blue on the female is a little deeper in person, and covers all the area that looks yellow here. Male looks significantly more yellow, and I think may be a good bit younger? He's maybe a bit less than a foot long.