My chicks are eight weeks old, so I'm about to graduate from Raising Baby Chicks. However, I have one new problem that is serious. I put two tons of fresh white sand in my 18X6 run, and my girls are deathly afraid of it. They won't go outside of their coop, and that causes concerns because of the heat here in Coastal Alabama. Anyone else had this problem? I'm hoping they will get used to it, because I don't want to un-shovel two tons of sand. Thanks very much.