I have my tortoises in a 8x12 tortoise house and I've used sand on a rubber floor so waste clean up is easy with a scooper. The problem is the sand dust up the place and is about to choke me to death. Since I have asthma it doesn't take much to set me off. I thought of using hey or mulch but clean up would be harder. Any ideas? Remember this is a 8x12 foot house so I need to think about cost to.