So my chicks are almost 18 weeks old. One of them has had her wattles and red, full comb for a few weeks now. Another one had hers come in red and full over the last few weeks. I put a little pile of oyster shell out for them today. I made sure they had plenty of feed as well, separated. They ate all the oyster shell. All of them were eating it, even the one that has no comb or wattles and still has a pale face. The one that is probably closer to laying did eat quite a bit. Will it hurt the ones who are not close to laying? Are they eating it just because they saw the other one eating it?