I am currently building a vivarium for my wife and I to house a couple of red-eye tree frogs. I would like to know, how do I regulate the humidity with the screen top? I have coconut fiber substrate and a few plants that will form a canopy, and some sickly looking ferns that may or may-not take hold. I also would like to know what ivy and other plants would be good for the frogs? Also can I grow a water-plant in a deep water dish with some kind of submerged soil that the frogs would sit on? Or is this just a bad idea from the get-go? (I think the water dish is too deep for "small" tree frogs and they may drown. Thought of putting something in the bottom just to keep from having friends constantly saying "hey the water is low.") Any help would be appreciated.