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My betta fish looks sick. What's wrong and how can I help him?

Updated On September 23rd, 2025

Pet's info: Fish | Betta | Male

What happened to my beta fish? :(

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on January 12th, 2020

The color change could be due to poor water quality, poor nutrition or high ammonia levels which can cause "burns" turning scales black. His fin position indicates he is under stress. They are droopy and not spread open like in the other image. Use a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with nitrates at 20ppm or less. Perform partial water changes to stabilize chemistry and/or to improve water quality. Use only conditioned water that is temperature matched to prevent stress or shock. Bettas are tropical fish and do best between 78 F and 80 F.

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