i do not have a humidity gauge, but i read online that in a still air incubator, you want approx half the space inside to be water in a container. doesnt matter how deep just that its takes up that much room to get about 50% hum or something. ne one suggest how big of a container to have in the bator. i have a 9x9 tin tray with water in the center of my bator, should that be about right or smaller? thanks