Just an observation, but those temps seem way to cold! The cool side should be around 82 and the warm side should be low 90's.

Also, how old is this snake? If it's an adult, then a 30gal is fine. A baby, however, should be housed in no larger than a 20long...and that should have lots of decor and good tight hides. Unlike some other pythons, balls need to have their homes nice and 'small'. Bigger is certainly NOT better when it comes to housing these snakes. I would nix the 125 gal idea and just get a nice 40gal max for an adult. Something around 48"x18"x12" would be good. More floor space than height and two identical tight hides.

Chances are, your snake is stressed out from the cool temps and too much room.