Recently purchased 2 Leopard Geckos and was wondering whats the best loose substrate. They are both fully grown geckos and are healthy. I see people say sand, then others say sand is bad. I also see people say eco earth, then others say eco earth is guarenteed death. I see people say coconut fiber, then others say that will kill them instantly. What do I go with? Im not a fan of paper towel or tiles, it doesnt look natural. I would like it to be as natural of an enviroment as it can be for them.