Just noticed our chickens have fleas around their eyes, combs, and ears ducts. Havent found them anywhere else on their bodies. I looked on the other posts and they suggest DE or Seven dust. My question is what strenght Seven dust and if you dust the birds and the coop, can you still eat the eggs? If you dust the entire coop, they will ingest some of the seven dust just by normal eating and scratching. I refuse to give them a bath, I have 18 chickens! Need advice Please.