Over here in England it rains a lot, and my hens were getting soaked and didn't seem happy. So I've put down paving slabs to keep them out of the mud and left a big square spot which is for them to dig and play in. We have also just put a felted roof over the top of the run. The only problem is were there run is it's very isolated so there's no direct sunlight in the run because the of the new roof, so It makes it a bit dark in there. Is this a big problem? What should I do?