Our amish chicken coop came last week and it is beautiful. It is 5'x8', has 6 nesting boxes and roosting poles and great ventilation. While I am waiting for my chickens to grow up I started to build their run and I recently finished. The run is made of 2x4s. The run is 4'x8' and 6'high. It also has a top. I used 2x4s and black welded wire 1"x1". It looks great and all the panels are done! Now I have to decide if I should put wire in the bottom of the run. I heard this is bad for the chicken's feet? If I do put wire on the bottom of the run I want to put sand or dirt ontop of this. How much sand/dirt will I need? How deep can they scratch? I really wanted them to be on grass but if i have to use sand, Is sand okay for ducks also? Thanks!