In my glass tank I switched to a night heat, no light 100watt and have had no issues with humidity, although I do mist once to twice a day. Just the drift wood.
I maintain
91-94 hot side
80-82 mid tank
73-76 cool side
50-60% humidity cool side
35-45 hot side.
But after reading this thread I'm going to be looking into a pvc box ay and using the glass tank I have now for future QT