Please Help. Our 9 girls are about 8 weeks old and yesterday the were taken from the cage and put in the hen house, today they are going to experience the run for the first time. I have been using the medicated chick starter crumbles and am using that up and changing to the next feed bag. They will be in a 30 X 8 run and often out on the property when I am home. But when should I start the Grit, is it too soon? Thanks to all.