The first thing I would do, is to candle the eggs. See if they are fertile. This can be done by viewing blood vessels right below the egg shell itself. If you don't view any at all, then there is a good chance that the eggs you have are shelled over slugs. It happens.
If you do see vessels, then you have fertile eggs.
I've had eggs that for one reason or another, have had these "spots" on them as well. Some call them water windows.
Like there was not enough calium to shell the complete egg.
But, what you are decribing is not that. If you see these "areas" growing.
A live egg, produces what I call "fungus guard". They keep mold and fungus at bay. A dead egg, does not, and surcomes to mold and fungus within hours of being laid.
So, what I would suggest, is to candle the eggs, and find out if in fact they are fertile. And then go from there.
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Ron Billingsley
www.ronbillingsleyreptiles.com

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