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My flowerhorn fish is gasping for air, high nitrates. What do I do?

Updated On September 23rd, 2025

My flowerhorn tanks water has exptremely high nitrate level . I returned from vacation yesterday to find a cloudy tank and high levels nitrate . I did a 50% water change and added prime . He now is gasping for air or at least that’s what it looks like and nitrates are still in the red . I was told to add aquarium salts and wait it out . I’m scared I’ll loose him . What should I do quarantine

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on September 28th, 2018

If you can get him into a separate tank, that may be helpful. Remember though, a rapid change in nitrates can be just as dangerous as elevated nitrates. Maintain temperature and oxygenation. Use an air stone or bubble wand if necessary. Perform another partial water ( no more than 30% total volume) in a couple days, then again in another 2 days to gradually reduce nitrates. Live plants will also absorb some of the nitrates. There are also commercial products that can be used. Only one method of treating the tank should be used each day to prevent a rapid decrease in nitrate levels.

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