Hi everyone! My name is Karen and I am new to this group. I have 5 hens, 3 roosters, and one guinea fowl in my flock. We have had our flock for 9 months. One of my roosters started crowing differently when we had a severe drop in weather. He now is congested, has green poop, and is not as active. The rest of my flock seems fine. I started using ACV in water the past 2 days and he is separated from flock. Please advise what to do