If your UTH hot spot heat and ambient cool side are within range (88-90 hot spot/~80 cool side), then a lamp isn't necessary. It just kills humidity.
If you have difficulty maintaining ambient temps, then a lamp may be needed for an extra boost.
And having 2 or more hides are always good if you have an open tank.
As long as there's no standing moisture on the floor or the walls, I wouldn't worry about humidity being too high for the time being. As long as you have good air circulation, it's fine.
You should provide water at all times. And ball pythons don't normally soak unless they have mites or the temps are too hot, so you probably won't see him going into it. It's more for drinking and maintaining humidity.
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