Shutting off the fan will also help humidity as any air movement removes moisture. I use both as well since my cooler runs 24/7 <gotta love living in the desert> and temps do tend to dip a bit low overnight. I use a dimmer on the lamp though, keeps an ambient of about 83. My cool side does drop to about 77-78 overnight in my girls tank, but she is really good about thermo regulating herself. It took a while <and some hair pulling/ overwhelming desires to drink> to find that sweet spot with humidity, tank is a consistent 50-53% now.
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