FIX%20PEN%20500%20(Penicillin%20V%20Potassium)%20is%20an%20antibiotic%20used%20to%20eliminate%20bacterial%20infections%20in%20fish%20tanks%20and%20aquariums.%20It%20is%20useful%20for%20control%20of%20gram-positive%20and%20some%20gram-negative%20bacteria%20present%20in%20fish%2C%20and%20can%20treat%20illness%20such%20as%20flexbacter%20infections%2C%20fin%20rot%20and%20tail%20rot.%0D%0AFor%20treatment%20of%20common%20bacterial%20infections%0D%0ANo%20fillers%20or%20additives%0D%0AMade%20in%20the%20USA%0D%0AUseful%20InfoDirections%3A%20Add%20one%20500mg%20tablet%20into%20aquarium%20for%20each%2020%20gallons%20of%20water%20to%20be%20treated.%20Repeat%2024%20hours%20later.%20Make%20a%20partial%20water%20change%20between%20treatments.%20The%20duration%20of%20treatment%20will%20depend%20on%20the%20type%20and%20severity%20of%20infection%20-%20it%20is%20recommended%20that%20extended%20medication%20baths%20continue%20for%20at%20least%205%20days%2C%20but%20no%20more%20than%2010%20days.%20If%20there%20is%20no%20improvement%20after%205%20days%2C%20discontinue%20treatment.Storage%3A%20Keep%20container%20tightly%20closed%20and%20in%20a%20cool%2C%20dry%20place.Warning%3A%20For%20aquarium%20use%20only.%20Not%20for%20human%20use.%20%20This%20product%20should%20not%20be%20given%20to%20fish%20intended%20for%20human%20consumption.%20In%20case%20of%20accidental%20overdose%2C%20contact%20a%20health%20professional%20immediately.IngredientsActive%20Ingredients%20(each%20tablet)%3A%20Penicillin%20V%20Potassium%E2%80%A6.500mg