Hi everybody. I have 4 chicks...2 Black Australorps (2 weeks old), 1 Buff Orpington, and 1 Light Brahma (both 4 weeks old). I recently put some sod (dirt with the grass too) into their brooder last night. They enjoyed it and have been picking at the dirt and grass. I took the sod out of the brooder today after about 18 hours of exposure to the birds. I want to kee the birds exposed to the dirt and grass but I don't know how much to give them. Its only a small amount in the corner of the brooder. Can i constantly keep some dirt and grass in the brooder or should I monitor the birds' intake? I have also been giving them chick grit. Thanks.