I used straw in my new coop and run, and its smelly after 4 days, I thought it was not supposed to smell so soon, the run straw is a little damp, i have "fluffed it with a stick to dry it. How often do i need to add staw? or change it? I have plastic under the coop straw is that the problem? coop is looking good, and I rebuilt the run yesterday and the girls are dry and happy in a huge pouring three day storm. new pics next week.