Chicken Eggs

10 Chickens (9 hens + 1 rooster).
They are about 1/2 year old. We are getting about 5-6 eggs a day.
Pretty good.

Occasionally I find soft shell eggs. Are they still good to eat?
Looks like those chickens just need more calcium, but it could be more than that.
Kim got crushed oyster shell, but they don't like it much.