I have four hens and currently two, but sometimes three lays eggs with extremely thin shells and I can't seem to figure out how to remedy. We live in Norther Maine and the four currently reside in a 4x4 coop, but up until a couple of weeks ago we had five hens and a rooster with two 4x4 coops available with a shared run which is 5ft X 15ft. (The four are now together in one coop as we recently rehomed our rooster and we had one hen with water belly and had to be put down a week ago.) We are currently feeding them Dufour 16 % Egg Maxx Pellets. They get 2-3 handfuls of mealworms each day, oyster shells are available and I try to feed them cottage cheese a couple of times a week. It rare that they get any other "treats" except when it's really hot I will give them some watermelon or frozen veggies. I did just find out that we have a mite issue, but I got that right under control in a hurry with Permethrin and they always seem to have this issue. Thoughts anyone??