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I have a (approx. 4 inch) 2 year old goldfish in my 10 gallon tank by itself. Previously, it had fungus growing on it's side and body area near the lateral line. I used PIMAFIX - Treats Fungal Infections on my goldfish and later about 10 hours later fungus and white stuff started growing on the tank and everywhere. This had NEVER happened before in my one year of keeping fish before and it was after I used the medicine. I quickly cleaned the tank and replaced the water 100% and then added chlorinated and the medicine again. That was yesterday, then today when I came back from school, my fish's fin is rotting!!! In the tank in which the 4 inch goldfish was by itself, I use an air pump, and a 70-72 degree heater. I change the water 50% everyday. Please help me out as this is the first time I have to deal with fin rot and it was after using medicine.