We have 7 pullets in a tractor I recently built. The "coop" portion of the tractor has a floor and walls. I cleaned it for the first time today since the chickens went in (a week ago.) I have straw as the substrate inside the coop. Where I have their water, it got incredibly wet and mixed in with their feed so that when I cleaned the straw, there was like an inch paste of wet food on the bottom. Do you feed while your chickens are in for the night? How do you avoid this mess? They are being moved daily/every 2nd day and have a HUGE supply of grass. They're also fed treats. Grapes were a big hit today!