As mentioned in my previous post,play sand is fine. I have raised numerous juveniles on play sand, but I prefer finer sand. Loren, you need to do your homework before making comments like "most compassionate people will give their web-foots more substrate." Most P. rangei keepers and breeders that I know prefer to keep the geckos on 1/2-1" of sand. There is absolutely nothing wrong with having a shallower layer of substrate, and all of my P. rangei are thriving. Since I am a breeder, I find it rather labor intensive to search through deep layers of sand for eggs. When I used to keep the geckos on a deeper layer, I often accidentally broke eggs.