Some take a while at first. Once they breed once and figure it out, it gets much easier from there. Some can take a while to bond enough for the female to be receptive to a males advanced IME. Enjoy the tank while it still isn’t a war zone haha.
be patient bro.. When i got my male it was about that size.. took him about 1 to 2 years only he started to mate with a female.. now waiting to see the pups... most likely by mid January the female will give birth