My son has a lovely Leopard Gecko that he got for his birthday, he has been taking excellent care of her and loves her very much. I want to provide the best conditions for her so that she lives a good long life. What is the best material to have on the floor of her tank? Right now she has the reptile carpet, but it makes her place look like a miniature golf course. What do you think about sand? There is the regular, the calcium-fortified, and the vitamin-fortified. Which, if any, is best? Reggie (the gecko), Davey (my son), and I all thank you!