Do you leave food down at all times or pick it up?I just got my first two chickens. I'm still learning. I have a feeder that I have just been leaving down. IT's been 3 days and they haven't eaten it all.Do I need to change out the food every day. Should I get a smaller feeder so they eat all the food and have room for fresh feed every day? I've also noticed a bunch of flies. The run that's attached to the coop is just grass. I've cleaned out the coop but not the run since it's grass. How wold I go about doing that? Is that the only way to get rid of the flies?