Advertisement I have a 3” P. metallica that I just put up a picture in vent sexing since it always destroys its molts. So if you are good at sexing them, feel free to go have a look. But I actually do have another question. Somebody once told me, and I don’t know if there is any truth to it, that once a P. metallica matures, one of the sexes turns black. Is that true? If so, would that be male or female?