Hello!
I have 2 balls in a 55 gallon with the same problem as you. I have several water dishes in the tank, and found that placing the water under my light source only makes the humidity worse. Also, I found that putting something over most of the tank didn't make a difference. I use the lizard litter stuff that you get from a pet store (can't really get anything else in CT, and if you know of something I can, please let me know! That stuffs expensive....) which holds moisture pretty well. I spray the tank every day just to relieve the dryness, but I think I may try this homemade humidifier. Does anyone know if this is loud? Thank you
Ginger