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Why does my fish float after water changes? Swim bladder disease?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Female

My fish has been having some floating issues lately, and I believe it's been anything from over eating to low water temperature to not enough electrolytes, but now I'm noticing that she floats after I change her water once a week. I started adding aquarium salt to her tank today, she has a heater, I feed her pellets every other day, and I add tap water "neutralizer" or whatever it's called to every partial water change. Could her swim bladder be affected by the water change in any way?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 12th, 2017

Water quality can definitely contribute to swim bladder disease. Keep the water temperature between 78 F and 80 F. Use a small filter if you can to maintain water quality. When performing water changes, use aged or conditioned water that is temperature matched to prevent stress or shock. Keep a large container of water out for 24-48 hours prior to use. This "aged" water can then be conditioned with StressCoat, NovAqua or similar conditioner prior to changes. Use no more than 1 teaspoon aquarium salt per gallon of water as a general tonic.

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