I have a rack I just built that holds 21 concrete mixing tubs. I am feeding 30 carpet pythons/ball pythons a week. What is the best way to breed the rats as well as how many do I put into each tub. What are max numbers of small, medium and large rats per bin?

What is the best food for them to produce at optimum level?
What is the best bedding for the price to keep them on?

How often should they be changed out to keep smell at a minimum?

I appreciate it if someone can help me answer these questions that would help me out a lot a lot.

Thank you very very very very much in advanced and thanks for looking.