I have 9 girls. 2 that just started laying. 5 that are at least a month behind, 2 that may be longer before they lay. I put out the ground chicken shells in a different feeder and they are all eating it like it's food! I'm assuming it's the new novelty of it! But should I wait to put it out until they are all laying? I thought they would only eat the eggs shells if they needed calcium...kind of like grit! I don't want to hurt the girls that aren't laying yet by allowing them to eat it!