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Need help please!

I have 5 goldfish, 3 are housed in a 40 gallon tank and the other 2 are in a 30 gallon tank. However, one of my goldfish for some reason starting to show a black smudge on its fins, the other 2 are fine. I’ve been changing the water every week, and started to cut back on feeding them as well. I then quarantined it, and tried to use the API General Cure, as well as Epsom salt, but not sure if it’s working. Not sure what else to do. Please help!

Thank You!




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That looks to me to be ammonia burns.

Do you have a test kit? 

Have you tested your water lately? 

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