Need help! Lost one of my speckled sussex pullets (approx. 17 wks old) this week. She was lethargic, standing with her head under her wing and had watery poop. Thought it was cocci and treated her with corrid...she died after 4 days. My chickens free range most of the day. I now have two more sussex with the same symptoms and am at a loss as to what to do..... No breathing problems or runny eyes or nose, etc. I hate to think I may lose more of them! Any help greatly appreciated!