So I posted on here recently about a Blue Andalusian hen I have that has having some minor behavioral issues. I did mis-diagnose a molt, thinking she had already molted - turns out she was just getting started. That aside, she started having respiratory issues - constant wheezing, sneezing...just weird noises. I finally got a hold of her (she's extremely quick and agile) and saw there was a small amount of blood around her nostrils. I couldn't think what could be the problem, so I started to backtrack a little. I didn't think it was a disease, or the other birds would have it as well. What had I changed? I had recently cleaned out the coop and run. Could it have been the shavings? I didn't think so since I've always used the same thing. I had read that diatomaceous earth can help with mites, lice, as well as de-worming properties. I checked on here and there are just glowing reviews of the stuff. So I added some to the coop and run after I'd cleaned it out. That was about it. So I started reading about D.E. again, and it turns out a lot of people also think it can be harmful, and it is an old wives tale type of thing. I will say that I re-cleaned it out, and removed all of the D.E. - and the respiratory problems went away almost immediately. I think I'm coming down on the side of the stuff actually being detrimental to the health of the chickens. Has anyone else had experiences like this?