Either one is fine1. Is it ok, to use vermiculite or it's bette to use perlite?
I never have used anything to seal.2. Why do you cover the top with foil, before putting the cover on the box?
I never had that issue a little condensation may buildup on the sides but should not on the top.3. How do you prevent the condensation from dropping on the eggs (since it's pretty high humidity inside the box)?
Here is my recipe
(1) 7 quarts Tub
(6) cups of vermiculite
(4) Cups of water
Egg crate
And there you go
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Stress free method that works every time.