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Yes, don't use that. Use either Corid or Sulmet. Corid is preferred.
Also, give them all probiotics (plain unflavored yogurt works. prepared probiotics work. Livestock probiotics work). In any case, they get about 1/4th a teaspoon per chick.
They really do best on medicated (with amprolium only, nothing else) feed. But if you can't get medicated, do the probiotics daily for the first week, weekly for weeks 2-6. Keep Corid and/or Sulmet around. (Corid is preferred for young chicks - it's gentler and not an antibiotic, only an anti-cocci medicine).
Duramycin is an antibiotic and should only be used if if if you know your birds have a specific type of bacterial infection listed on the duramycin package. Coccidiosis, which it really sounds like the bird might have, is a protazoa and antibiotics won't touch it.
Also clean out the brooder, clean all the feeders and waterers just in case.
The live bacteria in the probiotics will help establish more good bacteria in the gut. The living bacteria in the digestive tract of a chicken are literally the workers that feed your bird and protect them. So make sure those good bacteria get established in the first week to help your birds thrive.
Incidentally, the bacteria are what also produce many of the vitamins that baby birds need to grow - particularly those of the B vitamins.