I had a 1.3 colony (i Have since expanded ) and the only issues I had with leaving them all together was moms fighting over the babies. I had one mother who felt she was super mom and had to have all the babies at anytime. I ended up making a rodent rack and have since loved it. I have 4 tubs 2 grow out 2 birthing and the breeding cage. So I would say you may be OK depends on the moms but more than likely you will need to move them.