Excavator Clay for Leopard Gecko?

[DiscoPat]

I always heard that leopard geckos don't do well on anything that is loose substrate but if I could that would be awesome. My gecko is still very young.

So would the standard 40% sand 60% eco earth work just as you usually recommend? Or is it different for leopard geckos?

If it is the same mixture would I be able to use soil from my savannah monitors enclosure? It is was dug up from untreated soil.