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Why is my fish floating upside down after tank cleaning and eating?

Updated On September 23rd, 2025

We change the water in the tank and fed the fish the fish ate and now it is floating upside down but still breathing what is wrong?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on December 27th, 2017

ECheck the water chemistry. The recent water change may have upset it. Use a liquid home test kit or submit a sample for testing to confirm 0 ppm ammonia and nitrites with a 40ppm or less nitrate level. Confirm proper temperature for the species of fish as well. If necessary, another partial water change can be done to stabilize chemistry and maintain water quality. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. My preferences for conditioners include AmQuel Plus, NovAqua and StressCoat. Other options include StressZyme and Prime. To manage swim bladder issues, withhold food for 2-3 days then feed bits of cooked and shelled green peas. Do this until the fish is swimming and defecating normally. Fast one day a week to maintain regularity.

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