Reptile & Amphibian Forums

I work at a zoo and we have a leopard gecko on exhibit in our education building. It was on play sand but I noticed that all of its feces were made completely out of sand. If you picked one up and crushed it, it was all sand. So I am worried that the amount of sand she is swallowing will cause impaction. I was wondering what anyone would suggest as a good substrate for this animal that would also look good on display. I have seen that calcium sand is also possible of impaction. I would love any help and advice anyone has to offer. I saw something at the pet store tonight, millet blend by Zilla, does anyone know anything about this product. We also have a blue tongue skink on sand that I want to take off of it just to be on the safe side so I would appreciate any help.
Thank you.
-----
1.1 Motley het butter corns
0.1 Snow corn
0.1 Okeetee corn
1.0 Anery mutt corn
0.1 Stripe Ghost corn
0.1 Amelanistic corn het carmel
2.2 Colombian Redtails
0.1 Striped Colombian Redtail
1.0 Hypo Colombian Redtail
0.1 Hogg Island Redtail
1.3.1 Brazilian Rainbow Boa
1.0 Anery Kenyan sand boa
0.1 Normal Kenyan sand boa
1.1 Mexican Rosy Boas
2.0 Ball Pythons
0.0.1 Banded kingsnake
0.1 Jungle Carpet Python
3.0 Bearded Dragons
3.0 Leopard Geckos
0.2 Snow Leopard Geckos
0.0.5 Sulcatas
and lots of fish

Chunks of slate are about the only thing I can think of that looks at least natural-ish without posing an impaction risk.
-----
0.1 Albino Leopard Gecko - Tigger
0.1 Crested Gecko - Pooh-Bear

I made a nifty guide on a local herp forum detailing how to make a display tank natural and safer at the same time

Check it out = easttnherps.com/yak/index.php?topic=5.0
-----
2.4.0 Leopard Geckos
0.1.0 California Kingsnake
0.1.0 Copperhead
1.1.0 Eastern Box Tutles