I don't open mine except:
-- to add more eggs, up to 8 eggs max in a 16oz cup, and
-- near the end of the incubation period when the eggs respire more, I fan them out every few days, and
-- to remove hatchlings.
I don't vent leo egg containers, as I find they dry out too fast if I do. Other species I do differently (big masses of colubrid eggs, for example).
Everyone has tricks that work for them, and figuring them out takes practice.
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