We plan on having four hens in a 6x4 raised coop. They'll be running on a full acre of land so that's no issue. I was wondering about coop flooring. Which is best? what works the best for you? And what is the most cost effective? I'm new to chickens completely so I've seen everything from wood shavings to sand. My husband was thinking a grated floor with hay overtop but I wasn't sure if that would be sufficient for their little feet.