I bought 3 ducklings about 3 days ago so they're about a week old now and once we got them they were ok but one of them started to become weak and had one eye closed and it was tearing as well the but the other was fine the day after. We were going to take him to the vet the next day because it was late but he didn't make it through the night but I talked to a teacher who is very knowledgeable about poultry and he said that it must have been a disease I can't remember the name of but hopefully you can still help what I do know is that it's transmitted through the ducklings eating each other feces. They seem healthy and happy at the moment and aren't showing signs of distress like our previous duckling. I was feeding the ducklings regular chick starter and after talking to my teacher he said to feed them medicated chick food even though I read they can over medicate so I have just been mixing the 2 chick starters together trying to counter that. Their faces are also a little runny but still solidish but the one I'm current concerned with doesn't seem to eat and drink as much as well as poop infact I haven't seen it do so. And one more note the ducklings are Pekin ducklings.