I was getting soft shells from my RSL pretty regularly. Some were rough in texture and hard for her to pass. They have oyster shell available, but never touch it. So twice a week I give the girls (5 chickens in all, but the RSL eats most of it because she's alpha and a pig) 2 Tbs of cottage cheese or yogurt with some oyster shell sprinkled on top. They gobble it up. I haven't seen a soft shell since I started this about 3 months ago. I've never seen soft shells from any of my other girls of different breeds, but RSLs are egg laying machines and need a bit of extra calcium in addition to what's in the layers feed. Hope that helps.