I have been using sand for both of my beardies for over a year. I would not put one on it until they are 8 months old. My beardies LOVE digging in the sand, and that is the reason I use it. It is natural and looks good. There is a chance of impaction but you can greatly decrease that chance by hand feeding, or feed them in a separate container. If you are looking for an alternative then floor tile, or shelf liner are the best. If you do go for sand stay away from that calcium sand the pet stores sell. Its too dusty and the animals have a tendency to eat it! Play sand from your local hardware store is the best kind.