Not sure what you mean by sandbox, but most female dragons won't lay in dry sand. You need to use moist soil, vermiculite or bed a beast. The substance should be damp enough to form clumps when squeezed but not have any water dripping out. A heat light above it to warm it is also a good ideal. The depth of the egg laying medium should be 8-12" and the container size a little more than the length of your dragon long, and about half that wide. Depth should be deep enough to hold 12" of medium plus a few inches to spare (a 14-16" deep container is good).
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PHLdyPayne

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