So I've decided to get some rats, and I even got rid of the mice, as they weren't breeding. Question is, so that I don't have to bother with getting a different tub, is how big can the group go in that size tub?

Measuring it myself, the dimensions are: 34"L X 16"W X 13"H
I'm thinking, maybe 1.2 with babies or 1.4 without? I'll probably be breeding large rats.