We have an English style pyramid shaped coop with the roosting area and nesting boxes on top and the run underneath. The chicks will be going in next week. From what I've read, I've decided to go with sand on the floor of the run. Should I also use sand in the roosting and nesting area? We are in Los Angeles. If anyone has a lead on river sand in this area, please let me know. If not I will probably use paver sand. Does anyone know if there are any chemicals in this type of sand or if there is a better type to use? Thanks for your help.