I've just moved my ten 6 week old chicks to the coop, and for the first time, and offering chick grit in a separate container. It only contains about 1/2 cup, but they eat it all within 2-3 days, and attack it when I replenish it as if it is a treat. In the brooder, I mixed the grit in with the feed. The coop is a tractor ark that is moved daily to new grass, so I know they are getting grit that way too. Should i be concerned that they eat this much grit? They are healthy, growing and thriving. They eat their regular chick starter just fine.