We have hatched all of our eggs the last 3 seasons at 87 to 90 percent humidity with no losses.
You do not need 100% humidity to hatch eggs and that's a great way to find out what mold growth looks like.
If the eggs start to dent in early just add some water to the tub.
You hit it on the nail, calcium deficiency causes the pock marks, no worries as long as you incubate them correctly they should hatch out just fine.
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