Well first off, a 70-90% humidity is way to much. A ball python isn't from the rainforests and would be perfect with a 50-60% humidity. The temperature being at 70 is way to cold. It needs to be a good 15 or so degrees higher. One side should be the hot side in the high 80's and the cool side should be in the mid to lower 80's. Without proper ways to keep your snake, it probably wont last long. The pink belly could be scale rot due sitting to the wet mulch for a month and the 70-90% humidity. I would invest in taking him to the vet sooner rather than later. As well as a good set of lights, and thermometers and hydrometers to accurately maintain temperatures.