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dust is ok for them, but too much poopy dust and feather dander is not ok for them But I guess that a large shed with an open door thats cleaned often is fine. maybe its a genetic issue

could also be genetic. What breed are they?

Purple comb means some type of organ/respiratory issue. Medical approach is water-based tylosin for at least thirty days, or an antibiotic. If thats not available, mix a lot of honey and apple cider vinegar into their water. also try fanning out the coop to get rid of dust and stuff.