Before I get slammed here I am going to lay the foundation for my title of this post. I am an employee at PetSmart and I obviously have customers that I am able to persuade from sand because of the health risks involved and there are of course the rare group of people that refuse to get anything but sand. My question then is what is the best kind of sand I can suggest to these people to hopefully ensure the health of the gecko is not jeopardized. I always, always will add that the gecko should be an adult before sand is used regardless.