I dont worry near as much as I used to. When I first started hatching, Id worry the humidity wasnt high enough, and kept a lot of water in the hatcher, sometimes so much it would bead up on the window. Needless to say, I had some disasters. Now I dont have it any higher than in the incubator,and have great hatches. I am a firm believer as far as humidity goes, that more is not better.