What size tank are you going to move them into? Also how big are they?
Here are some crappy pics I managed to find from when I had my pair.
Sorry didnt have a decent camera back then.
One of the biggest way in sexing them is having the fish the same age and growing them out. Males will grow much faster sometimes double that of females.
Although it isn't 100% way of determing sex, you can notice the pointed fins in the male compared to the female in these pics.
And when they decided to spawn in was in a small over turned pot. This pic is right after the eggs hatched.
Good luck with the fish.
Brian