When I bought my first geckos from petsmart I had calci sand for substrate and thesE were the baby geckos petsmart sells And they did just fine with it. They say that your gecko could risk impaction if they are to young but mine were perfectly fine. If you have adult leopard geckos then the should be perfect with sand.
The fact is there is a risk involved when using sand to the animal's health and absolutely nothing to gain by using it beyond perhaps wanting a "pretty" enclosure.
Just because you haven't had any problems doesn't mean that your won't. We must remember that in their natural environment where leopard geckos come from they do not live on sand. They live in rocky crevices and hard-pack clay dirt strewn with rocks, so their GI systems are not adapted to pass particulates.sausage said:i have kept adult leos on sand for many years and never had a problem.
http://www.herpcenter.com/leopard-gecko-sand-impaction-xrays.htmlWe all realize that sand is an attractive substrate. The problem we encounter using sand though in captivity is that it forces the leopard gecko to live in an environment that mimics the Sahara Desert. This is NOT a natural environment nor is sand a natural substrate for this species. Sand makes up a very small portion of the wild leopard geckos habitat. As soon as owners realize that their leopard geckos safety and health is more important than how they want their enclosure to look, the fewer vets will have to deal with impactions.
The leopard gecko in the following x-rays had been housed on sand for the past 14 years. (You read that correctly. This gecko had zero issues with impaction for the 14 years it was housed on sand. Impactions do not discriminate.) Up until this point the leopard gecko did not have any visible issues that had caused the owner to worry about impaction.