I don't think you need to dust them. They will dust themselves in a cat litter box with sand and DE (you get the food grade kind at the feed store) or they dust themselves on the ground mine started to dust them selves at 4 weeks. They looked like they were having spasms One even laid on its side, and closed its eyes, with its legs staight out. I thought it was dead. It stood up when i moved the box though it scared me.
