Excuse me if I'm sounding rude here, but... having a glass tank is for you, not Pip. Your snake doesn't know or care how aesthetically attractive a glass tank is versus a tub, or how much time, effort, or money you spent on it. Again, trying to put this gently: you clearly are very inexperienced with reptile husbandry. Many of the people on this website who have years of experience and own multiple thriving ball pythons have kindly suggested that you change up his housing, just like you had to change up his food. We can't make you do anything but it is a little odd to me that you accepted advice on a change in feeding, but not habitat change. I'm glad he's eating and pooping though, and that his last shed was a good one. Obviously a lot has improved for Pip so far, and that is great!