Bettas should be acclimated to each other for about a week before you place them in the same tank. Take two large vases, place them next to each other with the male and female in each. Let them sit next to each other for a week, when the male has built the bubble nest and the female's bell is full of eggs, place her in the tank with the male. Watch carefully. When he's courting it will sort o flook like he's being aggressive. Eventually he will wrap himself around her and they will mate. The female will then go to the bubble nest where she will lay the eggs and the male will help place them inside. Once they're done REMOVE the female. He will immediatly start being aggressive to her. Eggs take 24-36 hours to hatch. Once they hatch, remove the male to another tank.