We have a fly issue. We've started keeping our grains in closed containers, not letting treats sit around and I'm at a loss of what else I can do. I looked at fly predator but don't know if we have a large enough population to justify. They are just around the coop. We clean the hay every two weeks and then burn the hay we clean out. Any ideas? Do the fly bag traps work? I really don't want strips hanging around...