You should tell Meyer. They might replace her for you.
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I would say run it for about a week and then keep an eye on them. You can give them vitamin/electrolyte water for a few days afterward if you're worried.

To be perfectly honest, if the other chicks are doing well- no diarrhea, good appetite- I would not medicate them. Especially tetracycline which has been proven to harm growth plates in growing mammals-not sure how it affects growing chickens though....
I totally agree!