Im going to go into some detail so someone can help and I cover all my bases. I have 4 Silver Laced Wyandottes that are 9 weeks old. I hatched them myself. They have had runny poo since they were born. Sometimes its a little more solid. I was concerned about their poo and posted last week and someone recommended another forum that had pics of chicken poo and what they were doing seemed normal. I talked to a chicken guy at Tractor Supply, he recommended Duramyacin. I put some in their water two days ago. Today I go out and there are a whole bunch of feathers on the ground and one of my roos threw up. Well yellow stuff came out of his beak. I had just changed their water and gave them fresh with vitamins in it so the water is yellow too. I still have them on medicated chick feed, chick grit, and my hubby just started throwing them some scratch about a week ago. They all seem to pant a lot. Beaks open while breathing. I am fairly new to chickens and this may not even be anything I should be concerned about, but I feel like I need some advice here.