first: how are you measuring temps and humidity? and i assume ALL heat sources are on thermostats, yes?
second: bulbs suck any humidity out of the tank, and i would recommend not using them if possible.
also, i'm guessing the tank has a mesh top: are you covering it with anything to trap humidity? for my mesh top i have it covered with saran wrap with a couple slits cut into it. and certain substrates do a great job maintaining humidity: what are you using?
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