I was gone for 5 days and when I picked my rooster up he had a cough, sneeze and was gurgling. The place was not particularly clean. I've treated for lung mites with Ivermectin. Am thinking of putting antibiotics in my flocks water for 10 days. Any suggestions? Please help. This is my first flock. He is a Buff Orpington and he is 4 mos old.