How to fatten up a ball python? I think the answer definetly has something to do with feeding rats instead of mice. But I'd also say put them in a rack! I can't help but noticing that since I finished my rack a few months ago ALL of my ball pythons that now live in it are feeding VERY consistently. I think it probably just has a lot to do with how much easier it is for me to maintain perfect husbandry in a rack rather than displays. Displays and aquariums sometimes lead to fluctuating humidity or temps, but this doesn't happen nearly as much in the rack system.
Anyways, thanks to all for the help with the rack design a while back, I'm VERY happy with it!