Man,
My pair are always together and he has a corner of the tank that he goes to when there is food in the tank. So to catch him, I fed the tank, let the female disappear for food then netted him very easily.
I also transfered him in water rather than dry in the net. My thinking was I did not want him spitting the babies in the net if he got stressed.
Good luck and let us know how it goes.
Steve