Substrateless.
Diffuser with 4 feet on it (essentially just a spacer in each corner to lift diffuser out of water so air can work all the way around the eggs) & water, press-n-seal.
I realize it's just a small sample size, but hatched out 25 of 25 eggs last year. Zero bad eggs. No mold.
In theory it makes more sense to me than using any substrate.
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