Has anyone had any issues switching from mice to rats? There are two reasons I'm asking. 1) Gene is getting pretty big, and I think feeding him a small rat would be better than feeding him two mice, depending on the size of the rodents, and 2) The place I get rodents from (Hoosier Mouse Supply) has a minimum 20.00 order and with mice, that's an awful lot of critters I'd need to set up habitats for, and that could get mighty expensive. With rats, I would order a lot less, and they wouldn't need as many different, costly habitats due to sheer numbers. Share your experiences!