What does everyone use as calcium supplement for their hens? I have a flock of 6 hens(2-23 weeks and 4-18 weeks) and 1 rooster. I bought layer feed but learned that high calcium levels in the feed can be bad for the rooster. So I’m getting an all flock feed and want to supplement my hens with calcium. I am crushing the shells of the eggs they lay and feeding them to the hens, what else should I give? I read you can crush calcium Tablets and put them in the shells as well. Are they over the counter tablets? Special chicken tablets? Is there a dose amount? What other things can I use as well? Thanks in advance!