I'm sure this has come up a few times but I can't find a thread that addresses it. My coop is two levels and I use hardware screen, I believe 1/4", which I'm told is bad on the birds claws. It's great cause everything falls through to the gound and it is very secure. I tried to use pine shaving but they scratch it through the holes until it's all on the ground, not in the coop. Now I'm using hay. They like it a lot and it does seem a lot easier on their feet but I hear hay can turn moldy. I'd love to hear opinions and preferences on this. Does anyone use a non-cedar mulch? Thanks So Much!!!