If its a mesh top aquarium, put a towel over 1/2 or 3/4 of the screen top and check back in 15 mins or so and see if it changes.
What kind of heat source is it? an undertank heater or a lamp? and whats the substrate?
40% isnt going to kill the BP overnight, you dont have to worry too much about the humidity being so low. this isnt quite an emergency
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