U need 2 have several females 4 the male 2 choose from, it's not a matter of throwing 1 boy and 1 girl in the tank. The male will build a bubble nest at the top of the tank when he's found himself his chosen mate. U need 2 remain vigilant because once the female deposits the eggs in the nest all the females need 2 b removed. The male will take care of the nest and the babies. Once the babies r large enuff tho, u need 2 remove them from the tank so the male wont eat them.