Hmmm...The eggs that I obtained which failed to hatch turned palest pink to white.
Thanks; I doubt it's the same thing as you're mentioning as it seems to happen within 24 hours and may even be immdiate, but the eggs at the very top of the clutches in my tank turn white- I'd assumed these were either drying out or infertile. The eggs are laid JUST above the water line- the area where they've been laid stays quite humid, although less humid than other tanks where there are closer-fitting condensation trays (due to the fitting of the external filter there are some gaps above the water line in this tank).