You leave a snake alone for a week min because they are stressed in the new environment. Unless he pisses all over i would let him be. If you have to mist that often to keep the humidity up you need to insulate 3 sides of the tank and put something over the top to hold the humidity. Also get a larger water bowl, a large dish will take care of that most of the time once you cover the top and put something around the 3 sides of the glass. Check the husbandry section on tank set up. It gives idea about how to help with this. Congrats on the new Ball.
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