I'm looking for a little advice. I have a 20 gallon long for my baby. He was born 6-4-21, so he's still a baby. I currently have the small Zilla UTH, that's rated for 10-20, but having a long that changes the dynamics a little. I also have a new medium 30-40 size. I'm waiting for my heat gun, should be here in a few hours. Would it be a better idea to put the bigger under tank on there, and move my ceramic heater to the "cooler side". My biggest struggle right now is humidity. I have moss under my coconut, so I'm going to move some of the coconut on the warm side and add some water directly to the moss. My humidity is around 45-50% which isn't where I want it to be. Thoughts??