I've never heard of a duck having pink eye i'll have to look that up. But there is Veterycin eye gel and also Terramycin eye ointment both will treat any eye problem. Ensure they always have a bucket or deep bowl to wash their eyes and nares out with. You can also use ACV with mother in their drinking water 1Tab to a gallon it doesn't sting and can also help with an eye issue.
if you read this it will explain foamy eye and even how over mating can cause it.
https://thecapecoop.com/foamy-eye-disease-ducks/
if you read this it will explain foamy eye and even how over mating can cause it.
https://thecapecoop.com/foamy-eye-disease-ducks/
