My chickens ark is infested with red might I've put might powder in them but its so dusty I'm worried that it could lead to problems with the hens breathing is might powder the best way to kill red mights?
Which mite powder are you using? Red mites are hard to kill since they also live in the cracks and crevices of the coop and only come out at night to get on the birds and feed. You can dust the coop and the birds with a powder like Sevin and then repeat again in a week to kill all the new ones that will have hatched. Or Ivermectin will kill any biting mites so you could treat them with that instead.