I also think glass tanks are horrible enclosures for abll pythons. They do not hold proper humidity and are too visible. Balls are seclusive and being "out in the open" or too visible can stress them out.
Im glad that my Monty Joe is an exception to this.
I for one am haing no trouble keeping the humidity up around 60 without covering the screen top. All I have is a humidifier in the room, and a 5 quart dish that sit's halfway over the heating pad. I have heating pad's over each end of the tank. The warm side stays at 89 pretty much all the time, and the cool side at approx. 80 during the day, and 77 at night. I use a 75w red light on the cool side that stays on all the time and a 100w that is on during the day and off at night.
And except for his sleeping times, seclusive he is not. My grandaughter loves to stand over by the tank at night and watch him. He seems to enjoy watching her also, allways staying in the area she is at. If she leaves his presence he starts roaming around until she comes back, then he is back to watching her. I wonder who is the caged one sometimes.
But of course this is how mine reacts, all BP's have different manerism's and stress points. Mine just happens to be a hardy feller I guess.
The only reason I dont use tub's and use the aquarium is I like to be able to see my snake, it is a permanent fixture in my living room.