I have 25 new peeps that will be ready to move outside pretty soon. I am getting the run ready at this point. The run is 20' x 20'. I have two questions. First, do I need wire on the ground? The chickens will not be out at night. My second question is, what should I have on the ground? Currently it is just dirt. Should I put shavings down?, try to get some grass planted? add sand? All advice would be appreciated.