Colony Question?

Last month i had a litter of 12 and after being weaned i put the babies in a large container. Now i have another litter of about 18. Can i put the litter of 18 in with the older litter of 12 without any fighting? The litter of 12 is about 6 weeks old and the litter of 18 is just about 3 weeks.

Yes, you can

It should not be a problem. I separate mine by sex. I put newly weaned ones in with 7-8 week olds. The older ones "mother" the young ones.