The tank is pretty dry even though I spray so often... I live in the Southern California desert and it's very hard to retain humidity.

I'll try the technique you described - thanks!
-----
0.1.2 Corn snakes (snow, okeetee, amel)
1.0 Crested gecko
0.0.1 House gecko
0.0.2 Chinese tree dragons
1.1 cats
0.0.1 African dwarf frog
8.1 betta fish