I've got chicks and wanted to go with a starter grower/ all flock feed so I changed feed. I am now getting soft eggs. My layers have always had oyster shell available but they never eat it. Any advice on what I can do to prevent the soft shell eggs and also not hurt my chicks with too much calcium? For now I can buy layer feed for my laying hens and my chicks starter/grower but in a couple weeks they will all be together and that won't be an option then.