Hi, I'm Sherre. I have nine chickens at the present. There are 3 red hens I inherited (they are about 2 years old) and 6 Americanas that I purchased as babies last spring. I have 1 of the Americanas that is laying currently and the 3 red girls. One of the red girls gives me eggs that have very weak shells. In fact, she put out one yesterday that was a real head scratcher...the yolk, the white and the membrane was there, but no shell. I feed pellets that supposed to help with their shells. I also give them oyster shell calcium on the side. They get vitamins in their water and I give them freeze dried meal worms and boon worms. Any ideas or advice would be greatly appreciated. I'm new to having chickens; relatives had them when I was a kid. Help!!! I don't know what to do to resolve this issue.