Save yourself the trouble and use the "No Substrate" method. This won't require you to make any drastic changes, but will take the guess work out of getting the water to substrate ratios right.

Head on down to your local hardware store and look for a sheet of egg crate in the Lighting section. It should cost roughly $10. Cut the egg crate to size so that it will fit inside of your egg tub and set it on top of your moistened substrate.

That's it. When the eggs come you can place them directly on top of the egg crate and won't have to worry about them becoming over saturated from any excess moisture you may have in the substrate. The water will evaporate and the eggs will get all of the humidity they require from the air. Every week or so you can add a couple tablespoons of water to the substrate and even if you add too much the eggs will not be adversely affected.

If you can't find egg crate the grate off of an old floor fan will work just fine. Anything that has holes and some depth (to keep the eggs elevated) will work just fine. Try to avoid any type of metal grate though because it may rust.

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