I caught and sexed one colony of 2m/2f as I was selling off the spare male to a friend.
Male 10cm I sold.
Vent shot
My 11cm alpha male. He's not in breeding mode atm so less hairy tail.
Vent shot.
9.5cm female.
Vent shot
10cm female
Vent shot. See that yellowing above and around the vent? (Ignore the poop btw). Seems to be a mature female trait.
Hope this helps.
Male 10cm I sold.

Vent shot

My 11cm alpha male. He's not in breeding mode atm so less hairy tail.

Vent shot.

9.5cm female.

Vent shot

10cm female

Vent shot. See that yellowing above and around the vent? (Ignore the poop btw). Seems to be a mature female trait.

Hope this helps.