I'm curious what everyone uses for dust baths? My chicks are only 4 weeks old so they are still in the basement. What age do they start using a dust bath? I plan to put them in the run and coop outside in a couple weeks. I was told by a few people that sand and diatomaceous earth is a good mixture but I'd like more opinions on what is the best/safest things to use for their dust baths. Thanks in advance.