Not really an uh oh. I just haven't raised a ton of quackers. When I had ducks out in the country the moms raised them even though I checked them often I have never seen patches is all.
My one group in town was fed flock raiser with nutritional yeast added, zero scratch, romaine lettuce as a...
Have you switched them to an appropriate food yet?
I understand he is smaller than his hatch mates even though they eat the same food.
Each bird is still unique and he may have more of a need than the others.
As a duckling he needs a starter feed like flock raiser or duckling feed. No scratch is needed at all. Scratch is on average only 9% protein which is far to low to give even adults except as an occasional treat.
Layer feed is formulated for female chickens that are actively laying. It has to...