For breeding, I'd wait until the girls are about a year old to give them chance to mature and fill out first. There are a lot of breeders around that will breed them too early. You'll have to keep him separate for a while before you physically introduce them anyway. Do the whole pouch swapping thing, even though he won't have cage mates for a short time he will still have gliders in the same room to communicate with. So about now is the right sort of time to be looking, by the time you've pouch swapped and introduced etc. Fingers crossed he is suitable to join your family.
