I read on another post that you should give them grit without calcium in it...I had bought canary grit and given it to them (that's what mypetchicken suggested) but I didn't even notice until now that it says on it, "granite grit, calcium and charcoal for superior digestion." Is that bad for them? I haven't kept grit in their brooder every day because they are pretty much just getting chick starter feed but every now and then I put it in because I have given them a few dried mealworms. Should I stop using this grit and get one that is not fortified with other stuff?!!! Thanks for any advice, the chicks will be 3 weeks old Monday if that helps any...