i've got 4female and 2 male in an critter nation double with the cages close from each other. i use newspapers (clean litter boxs daily and fresh newspapers once a week) no or very little order i keep it in my living room, the birthing cage is a 29g and i us aspen, and a litter box so i have to clean once a week. even the babbie learn to use the litter from mom.
hope that this helped you out