I do it a little different , I have 4 10 gallons just for foster mothers i Have the babies separated into size by grams and as they get bigger move to the next mother these mothers are great they treat them like there own and they haven't been breed in a decent amount of time. Then since my snakes all eat different sizes I have 2 20 gal grow out tanks for weanlings and small-med rats. Then in my other 2 20 gallons I have 3 females in each with one male. my local pet shop also takes whatever pups i don't need, they have one of my mothers two that once again as soon as i drop off babies is right to being a perfect sweet mother. This is still all in the works I just started 4 months ago