I am thinking about what I should do when it is time to get more rats. I won't go to a pet store-my options are adoption or getting them from a breeder. I normally would not hesitate to adopt, but I have had so many tumor problems with the group (mom and siblings) that I would like to try to avoid that issue in the future. I heard that breeders breed to lessen the chances of getting tumors. How well does that work? I know nothing's a guarantee. What would you do, adopt from the humane society or buy from a breeder?