Sorry to be asking redundant questions folks, but everytime I read people's posts and comments, it gets me thinking. So when should I absolutely start using grit? I know they don't need it while on the chick starter, but I'm reading that it might be necessary with other treats you give. I've been thinking about trying some new things. Apples and grapes did nothing for them, but I think they might like crushed cheerios or shredded wheat biscuits. At any rate, when is the grit absolutely necessary? I don't want to hurt my little ladies or make them sick. Thanks all.