I've always told people to not stress out when their snake stopes eating. Its not as if they'll starve themselves.
In my opinion, a ball python won't take advantage of a large tank like some other species will. Once it finds a comfy spot it stays there.
1. What and how would you feed a female ball python in a tub.
Hot spot of 90. Small rat 35-50g every 2 weeks. 42 qt tub. 1500g+ snake.
2. What and how would you feed a male ball python in a tub.
Hot spot of 90. Small rat 30-40g every two weeks. 32/42qt tub. 1000g snake.
This isn't exactly what I do every time, but its a jumping off point I guess.