My coop is 4X4. I have been using shavings on the floor and adding shavings once per week. Right now, I have 2 chickens living in it, but this weekend am planning to introduce 2 more in the coop. Every other day, I rake the shavings. There is no foul odor, but there is quite a bit of dried poop. When I add shavings, it's good until the birds start scratching and then everything is mixed up and the poop rises to the top again. Is it okay to leave it like that as long as the poop is dry or do I need to clean it out completely? I have DE, but haven't used it yet. Should I be using it all the time?