Have you got a link for where you found zeolite powder being used as a substrate? I have googled and cannot seem to find it mentioned.
We fed our Leos gutloaded mealies, always available, and dusted locusts. Our regime is to dust for 5 days with Calypso calcium dust and for 2 days with Nutrabal vitamin supplement.
Ours are on Lino as a substrate, easy to clean.