Two weeks ago I had a 8 mo brahma who would curl her toes, stretch her leg to straighten toes, and hop along. Was moving around although awkward. She faded neurologically and was paralyzed in 4 days. Died on 5th day. Second hen, also a 8mo brahma was fine in the morning. 3 hours later she was hunched over and puffy, eyes closed. Died an hour later. Third hen was a americana and she wassleeping alot more than usual for 3 days and when she tried to go out for sunshine, she nosedived and died. (she could have been old). 4th hen was barred rock and symptoms were same as first hen but 10 days later. Today another barred rock is off neurologically but eating and alert. I have not seen any discharge from the eyes or mouth from any of the birds. Poop is white and brown (dont know the fancy terms). Started antibiotics (tetra) this am for all 3 enclosures. Everything was cleaned and sprayed with bleach/water. What is going on? Very frustrated.