I have 5 PPs in a 60 gallon tank with a screen lid covered in plexiglass. I have a 5:1 ratio of playsand to Eco-earth with 8 inches of substrate all together. My 5 PPs have been with me for roughly 4 years now and we have had many successful molts with no cannibalism!

Anyway, I recently upgraded to this tank from a 40 gallon breeder, and although the temperature is perfect at 80-82 degrees, with a dip at night to 78 degrees, I notice in this much larger tank that the humidity often dips to around 70% and I like to provide them with around 80% humidity. I also run a humidifier in the tank for an hour in the morning and an hour at night. Do you guys have any other tips or tricks that you can help me with to keep the humidity levels at a more constant percentage?
Thank you all for any help you can give me!!