My female gecko laid some fertile (Or what appeared to be fertile) eggs on August 20th, and as of now, I don't really see much of a difference at all in the color of the eggs. For about 2 weeks, the eggs had a tiny vein on them then gradually turned a little red. But past those 2 weeks and they look exactly the same. From at least nearly a month now I would expect the egg to turn completely red. Every 3 days I open the incubating lid to allow fresh air, although I can't leave it open for too long as the temperature would change drastically. They're on perlite (Holds the water for quite a long time, I was recommended to use it and so far it's easy) and the temperature varies from 81.8 to 84.0 In roughly an hour per time. Just now I opened them to check and the red is roughly the same and they started to get this weird white looking mold, I don't think it's mold though. They don't smell bad, so I doubt they're rotting. The third Picture was from September 3.