I asked this before but I get contradicting information online. I’ve included pictures - his tail was originally pure white. I’ve been treating my goldfish for fin rot over the past few months with very little results. Now a black edge is forming over the tears in the fins. Is this a good sign or a bad sign? I have literally run out of money trying to fix this problem as I’ve bought numerous medications. He’s just finished a week long treatment for methylene blue and now I am seeing black on his fins.
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