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How to treat goldfish fin rot in a tank with live aquatic plants?

Updated on September 23rd, 2025

Pet's info: Fish | Gold Fish | Male | unneutered

One of my goldfish has fin rot. I just relocated them in a new tank (they were in a bad tank with bad water before, they have backstory that’s not important right now) with new water and all that, I only noticed the fin rot after relocating them. I heard about adding salt into the water, but they’re used to forest water and I have fresh water plants in there. Could you give me some information on how to treat it?

1 Answer

Most Helpful Answer

Todd Cecil

Answered By Todd Cecil

Veterinarian

Published on February 28th, 2019

Thanks for reaching out about Timothy & Lola. Have you tested the water for pH, ammonia, nitrites and nitrates? Correct any problems.
Adding non-iodized salt (aquarium salt) at 1 tablespoon per 10 gallons can reduce osmotic stress but is probably not a treatment for fin rot. If fin/tail erosions progress, antibiotics might be needed, therefore a veterinary visit.
Good luck.
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