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Listen to the doctor 
The issue of resistance in an aquarium environment isn't just with livestock (i.e. the bacteria that normally colonize livestock). An aquarium environment also houses multitudes of bacteria species that can live outside an organism. These bacteria can develop resistance over repeated exposures. If they become pathogenic (i.e. causing disease in other organisms), including humans, then it becomes a problem.
The issue of resistance in an aquarium environment isn't just with livestock (i.e. the bacteria that normally colonize livestock). An aquarium environment also houses multitudes of bacteria species that can live outside an organism. These bacteria can develop resistance over repeated exposures. If they become pathogenic (i.e. causing disease in other organisms), including humans, then it becomes a problem.