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Fin Rot on Goldfish


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I noticed that my goldfish started getting these tears in his fins, so I followed the instructions in this video (https://www.youtube.com/watch?v=wICf_0o6ys4) to treat for fin rot using maracyn and ich-x in a hospital tank. After the treatment I moved my goldfish back to the main tank, but now a few weeks have passed and it doesn't seem to be getting any better. What else can I do to help my fish? 

ph - 8.0

am - 0ppm

ni - 0ppm

na - 10ppm




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Watch carefully to see if another fish is nipping at his fins.  I have two oranda goldfish and one ofthem is a "nipper".  The poor other fish has small tears and rips in his tail from being bitten.  They slowly heal over time.

I see this behavior most often during feeding time.  I think it is food aggression.


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