yup they are figuring out which one is going to turn into the femal of the pare. femals dominate alot of the aquatic world both salt and fresh water. It will take sme time you may spot the odd scale missing from them while they are doing this. use alittle melifix in the water to help provent infections in there cuts. You don't have to dose as on bottle just half of the recomended dose you are useing it as a proventitive not a treatment.

Bill