Adding new females?

I bought a 1.1 thinking that's all I would need, but now I'm thinking I may want to add 1-2 more females. So far the pair I have have been great. The male has actually taken a part in raising the babies. My question is, can I just add 2 more females to the 1.1 after a QT period? Or would it be better to feed off the original female and start from scratch?

Thanks in advance for the help!

I think it would be ok to add females in with the 1.1 you have already. I have done this plenty and have had no problems.

There is always a serious risk adding a new female to a breeding group. On the few occasions I tried it, the new girl was found weeks later with her face eaten off...so clearly it wasn't all that happy for them.

However, I have had success in making new groups of adult rats by completely mixing them up--if you have just 1.1, remove the male and replace him with a different male, and add the new girl at the same time.

As long as ALL the rats in the new group are strangers to each other, they seem to work it out and get along much better.