Wow! Really? I have never had an issue with them not preferring sand, but... in fairness, sand is their very first available dust bath. I introduce them to their first sand bath at about 3 weeks of age, just days before I start weening them to the great outdoors with loads and loads of places for them to duck behind, under, in and around to avoid the adults when needed, and I even have it so that they can get into their brooder but the adults cannot (for those that prefer the familiarity of 'home'.