I have a new coop and run. As expected, the chickens have eaten all of the grass in the run and it is now mostly dirt. I rake it out every other day and due to the tin roof and the location, it is staying remarkably dry. My original plan was to fill it with sand at some point (prob next year) but now I am wondering if that is even necessary. Is it OK to have a run floor that is just dry dirt? Or should I begin adding sand? Thanks for the help.