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There are a bunch of brands that are okay - much depends on what your feed store carries.
I live near an Agway, and so we used turkey-waterfowl starter crumbles. I lowered the protein % by adding one part rolled oats (not instant, and I chopped them up fine) to four parts starter crumbles (as suggested in Storey's Guide to Raising Ducks).
At two weeks or so, I slowly started switching them over to a grower ration.
If all you can get is chick starter, then I suggest adding 100 mg plain (plain, plain, not any other kind) niacin per gallon of drinking water to prevent deficiency risk.
You could go with brewer's yeast. Forgive me for using capital letters, but for anyone else who may casually look over this thread, NOT baking yeast, NOT winemaking yeast. Brewer's yeast is a nutritional supplement and it provides niacin and a few other vitamins.
Ducklings need about three times the niacin chicks do. And some ducklings get leg problems or seizures if they don't have enough niacin.
Keep the little one on the supplements for about 8 weeks.