My chickens have had off on and respiratory symptoms the last week and a half. Then all the sudden I found lots of bloody stool and one chicken passed. A couple other off hiding and lethargic and sleepy so I started Corid in water. Now the respiratory symptoms have gotten much worse. All I could get my hands on is tiagard(denagard) can I mix the 2 meds in the same water? I have had conflicting opinions. They are wheezing and sneezing and making a crackling sound when they breathe!