Hello. Im new to raising ducks. I have 5 total. The first 2 came from a local feed store. They are almost 4 weeks old. The other 3 I ordered from a hatchery and are 9 days old. They are in separate areas and have not met. After I braught home the first 2 I noticed one was already boe leg and appeared to have hip issues. A few days later I noticed it was breathing harder than it should. I talked with a friend who raises all kinds of birds. She said as long as it was eating drinking and acting normal not to worry. Only a few days later I could hear a week and it appeared to be coughing with crusty eyes. Back to my friend who said to treat with 250 mg of amoxacillin daily for 7 - 10 days. Eight days of meds , Eyes look better and its still acting normal. Eating drinking foraging swimming. But the breathing and coughing has not improved. Long story short what do I do now?