Hi! Totally new here and I've been trying to read up on everything but need some help. Two weeks ago we bought a chicken run with a coop and 4 chickens that are just starting to lay. There is a section of our run that is not fenced in on the bottom. It is fenced on both bottom ends but the middle is open and the girls have enjoyed scratching there and taking dirt baths. We can't let them out where we live so this run is all they get. We also don't close them in a coop at night since the run is "closed". We are worried about predators and attracting rodents though. So should we add wire to the bottom middle of the run and will the girls be okay without any dirt to scratch or should we put something in there? Also, any suggestions for keeping the run clean? We have shavings in the coop and have been putting new in once a week but the whole thing is starting to smell (I think our city code is "keep the neighbors happy" and our neighbors are very close). Also, the wire used on the run has holes about an inch wide. Do we need something finer to keep mice out of their food? Thanks!