So you are incubating leopard gecko eggs too? If so you can just copy what you did with them and apply it with the turtle eggs. A good temp would be around 80 and humidity about 75%.
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0.1 Red Eared Slider, 1.0 Common Snapper, 1.0 Bearded Dragon and a 55gal Native Fish Tank with a LM Bass and Pleco.
I use to have a collection of Leopard Geckos that I bred, but have sold them.