Hello! I have two leopard geckos. They are cute little guys and easy to care for as far as reptiles go.
To answer your questions - It's not usually recommended to use sand, no matter what size/age reptiles are because if they eat any of it it can cause impactions. If you want a more natural looking tank, you can try getting sand colored tile. It looks pretty nice (nicer than paper towels or carpet in my opinion), is easy to wipe clean, and warms up well which the lizards like.
I use a 20 gal long aquarium with a screen top. Longer is better than tall, leopard geckos are terrestrial and spend most of their time hiding at ground level.
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