I know with my Green treefrogs, I had to up their mistings to twice a day, and my Pacific Chorus frogs to once day to maintain humidity levels where I wanted them. I bought a 2 gallon Flo-Master pump action sprayer with a mister nozzle that I use to spray all my enclosures and it works amazing!

Jess, I like the airstone idea...how deep does the water have to be for that to work well?