Just to make sure I am doing this correctly - I can house like 3 females together but once they become pregnant I need to move them to their own tub to give birth - correct??? Then after babies are weaned - that female can be returned to the tub with the other females.
I hope I got this right.
I can't speak for others, but what works best for me is just leaving the colony alone and taking out the weaned mice to grow on their own. The other females will help out mothers, and it doesn't disrupt the colony.