Coop getting bit smelly

some chickens do poop an awful lot over night (most of mine do  )  - you could try using hemcore or aubiose to absorb the muck a bit. Some chickens however don't poop much over night - I had two silkies of Cara and they never pooped in their coup just came running out in the morning and did huge jobbies outside. Me, Ice and Grannie Annie went to Hillfooters yesterday and I had a demonstration of his forsham coops and his girls don't seem to poop as much as mine either.

You could also try and sprinkle some Stalson F down on your coop floor.  Does your coop have good ventalation, especially when the door is closed.      Nickyx

we have hemcore in the coop and nest boxes, a thick layer that is poo picked daily and sprayed with virkon s weekly and turned, i use virkon as a liquid rather than stanoslan, to keeo the possibility of dust down in the coop, chucks can have lots of respiratory problems, also the reason for not using straw, when damp it can harbour spores in the stalks. hemcore comes lemon smelling as well, it all helps.

easibed horse bedding in the run, and i use virkon in the run as well weelky, stanoslan monthly when the run is turned over.

Just a thought which may not be relevant but do your cx have runny noses or any eye discharge?  Coryza is a respiratory condition well known for its distinctive odour and as this seems to have developed suddenly and your cleaning regime seems OK it could be worth checking your birds aren't the source of the smell.  Also rodents can cause smells check there's no waste food in the house or round about.  There should not be water or feed in there anyway.
HF