we have a coop and run that is on broken gravel, rocks and dirt. [they LOVEE it!!] and in the run there is ALOT of flies and i clean it out every two days and they free range so it cant be their poopie so what is it? what can i do? is it bad for them? I put some woodshavings on the ground in the run, it helped some but not alot. so what do i do?