Ok.
Heat bulbs are not really recommended for ball pythons, and temperature gauges are extremely inaccurate (you need digital only).
This is something how your tank should be set up. If he eats ok in the 20g, then that cage is fine, but if he refuses to eat then you might need to lower the enclosure size. Try to feed a week after getting him and don't handle him AT ALL during that week.
You need a UTH and Thermostat to control the temperature. You'll also need a couple probe thermometers and hygrometers for humidity.
http://i23.photobucket.com/albums/b3...t-Up-guide.jpg
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