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Those pics are of major niacin deficiencies. Ducks don't have to be so far along to have issues with niacin deficiencies.

Normal just means anything that isn't neon or blood seen in feces. As far as the charcoal flush, I would do a search here. Many have done it and it isn't harmful, but I've never done it - so can't give advice on the implementation. I was just giving it as an alternative in case the duck has...

Here's a good resource for niacin and ducks. https://metzerfarms.blogspot.com/2011/03/are-my-ducklings-leg-problems-due-to.html

Oh, also is he eating ok and poo look normal (for a duck)?

This thread has a similar situation - with good advice: https://www.backyardchickens.com/threads/hunched-up-duck.806530/ You could perhaps try a charcoal flush, it would help to flush toxins out if he got into something he shouldn't have. The thread explains how to do that as well.

Flock raiser is good, but I would definitely get the b3. To my knowledge, if its liquid any would work. The capsules could be "flush free" and you don't want that because it goes through their system too fast. I'm not sure if nutri-drench can be ordered from those places, but tsc and other...

How long has this been going on? What feed is he on? I can't say for sure what is wrong as it could be anything if its a male. If it were me, I would cut out all treats and only feed him his feed for now. I would give him nutri-drench which is a vitamin complex supplement. I would also stop...