I have 20 ball pythons in a variety of sizes. I decided to start breeding my own feeders and i chose mice since I can fit more of them in the same space than I would with rats. I got three colonies of 1.5 and it's looking promising, however I don't know if it will be enough, I will keep buying frozen in bulk though as mice takes time to grow. That's the major downside of mice in my oppinion...