03-16-2012, 08:57 AM
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You need to test your water and see where you are on that. What other fish are in there with it? Depending upon what other fish are present, if you can't relocate it to a hospital tank you'll have treat the main tank, I'd put some aquarium salt and melafix in the water. Most fin rot is bacterial, but it's also usually the result of something else being wrong; water, stress or other illness. If fresh water, salt and melafix don't start improving it, then you'll probably want to treat with antibiotics.