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"my fish got a bad case of bronchitis [...] we decided to get him some meds and boom! Within 2 days he was all new again and just kept swimming!"

Presuming they stopped when the "fish just kept swimming", this is how you (and the rest of the world) get antibiotic-resistant bacteria.

According to a BBC article I just read the other day, conventional wisdom might be changing on that.

"It is time to reconsider the widespread advice that people should always complete an entire course of antibiotics, experts in the BMJ say."

For most bacterial infections sure, but as a blanket statement for all abx treatment probably not.