Is chick grit just dirt? I went to a feed store and asked if they carried chick grit and the clerk looked at me like I was looney. Is it ok to just give them a little container of dirt from my yard for them to have free access? My chicks are 2 1/2 weeks old and still in their brooder. I don't plan on taking any of them outside to the yard for short recesses for a while yet, not until they are too big to fit through the fence.