I have one Silkie hen that lays paper thin eggs. All the others who eat the same foods and oyster grit lay perfectly find hard shells. What can I do to supplement her diet with more calcium? Is there another problem I should be looking at? I have liquid "calci-boost" but I don't know what individual dosage should be. It's too expensive to put in the water every day since it gets changed out 2 times a day minimum. Is this a one -time treatment for her or will I have to continue it forever? Any ideas?????? Oh, by the way, the other hens in the coop can't wait to break it and eat it. Yuuuucccckk! I can't be out there to stop them. I saw it happen last night. The egg had been laid less than 30 seconds and one of my other hens made a bee-line to it and broke it before I could stop her. Fortunately they have not broken any hard-shelled eggs.