hey guys. we put some drainage rock around the coop a few months ago. its also on the floor of the coop, but i have covered that with hay. but they still like to scratch around the rock outside of the coop. i just culled 2 of my hens this morning due to bumblefoot. i was going to try to treat it, but i read that oftentimes it returns....that hens that have it will most likely get it again. we are now down to 4 hens which isn't enough to supply us eggs for our family. 2 of the hens are older and 2 of them are only 3 1/2 months old. we would like to get about 3 more chicks. but i worry that they rock is causing the bumble foot? any ideas? i think the rock has cut their feet and then infection set in. please help with any advice.