The demise of the eggs after 60 days could be a sign the eggs need more air than you are giving them. The egg shell is permeable and oxygen must be readily available for the egg. There must also be a way for gasses released from the eggs to escape the tupperware or the gasses can poison the embryo.

An airtight container is not necessary and probably detrimental to the eggs, especially at 60 days when the embryo is getting larger and there is more of a need for oxygen. This is also a time when jarring of the eggs is bad-check the location of the incubator to be sure it remains steady. Poke a bunch of holes in the lid for air exchange, or place it on one side only.

Good luck!
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Tess Cook
www.boxturtlesite.info

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