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I went to a vet and he diagnosed my fish have internal bacteria and he gave me 2 small packets of erythromycin and told me that I just have to put them in my 20 gallon tank, take out the pleco and place it 2 hours later inside. He told me that I don't have to dose it ever again, just do the weekly 25% water change, however because I'm treating ich and doing daily water changes, I can't help but wonder if the erythromycin diluted in the water is trivial for bacterial extermination, so I wanna know If i should keep on dosing, how often? any aditional water changes necesary? and also if plecos really are intolerant of the chemical.