I love autocorrect. Not.
I think you meant crude protein, yes?
Anyway, seems to me if you add one part chopped rolled oats (not instant) - you can run them through a blender quickly - to 5 parts of 24% crumble you should be in the neighborhood of the recommended protein levels for...
I doubt there is too much protein in the chick starter. I need to close down for the night, but if the chick starter is really high in protein (check the Raising Ducklings sticky or Storey's Guide to Raising Ducks, I think the recommended protein levels are in there), you can add some chopped...
Stoney's Guide recommends giving a tiny sprinkling of chick grit on their food so that they can digest things other than just crumbles.
Brewer's yeast should be fairly standard, if I understand correctly, regardless of brand.
That's good to see (c:
I want to add that generally, plain niacin is best. But if that worked, yay!
@saraelizabeth
Here is a writeup I saved regarding B vitamins and ducklings. (You will see I emphasize plain niacin )
People often get confused about what to use, so please stick with me...