Thanks, I think I may try out just housing everyone together permanently from now on, rather than individual tubs for each mother with babies.

Another thing I thought about. If you have a group of females and a male, and one of the females has a litter say 2 weeks after another mother, and there is an obviously age discrepancy between the 2 litters, have you experienced any problems with those kind of situations? I can't imagine that all 3 moms housed in the same tub have litters at the same time.