I don't think I would worm unless you see evidence of worms. But if they have perked up already, you might not need to do the Corid, but doing it won't hurt (it doesn't develop resistant strains of bacteria, etc.). How far expired was your Aureomycin? And was it already open? If it was old...
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My bottle says of Corid says 16 oz. per 100 gal and have that as their only source of drinking water for 5 days (at least). So for 1 gallon it would be 0.16 oz, which is about 1/6 of an oz. Since an oz. is 2 Tablespoons, and a Tablespoon is 3 Teaspoons, that means that ONE oz. is 6...