If it's a garden dust or diatomaceous earth, those are safe but they most likely won't.okay. I put mite and lice powder on them. is it safe if they eat it? because I sprinkled some on the dirt
The most important thing they need is that chick starter though. You'd see a difference in a week. And, if they really do have mites, they need those nutrients in them to help as mites will drain them.