I have sand on the bottom of my brooder so it won't be slippery, and pine shavings on top. The chicks (not yet a week old) have excavated below the shavings, discovered the sand and are eating it like crazy. Is this OK? I know they will need grit eventually, but they are only eating chick food now. They won't fill up on sand will they? I will admit to being a nervous first time mom. Thanks.