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My fish got stuck in filter, tail injured and not moving. How to help?

Updated on September 23rd, 2025

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

My fish has got stuck in the filter, I have released her from the filter but she is breathing heavily and has damaged her tail. She’s gone to the bottom of the tank, is not moving or eating. I have put her in a separate tank so the other fish do not bother her. Her tail is red and looks like it’s filled with blood. What can I do to help her?

2 Answers

Most Helpful Answer

Angel Alvarado, LVT

Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on March 18th, 2018

Keep her in the hospital tank until she heals. maintain adequate water quality and temperature via frequent water changes, filtration and the use of a small, submersible heater.
Plain aquarium salt (NOT table or Epsom salt) can be used as a general tonic to reduce stress, increase gill function, treat minor infection and aid in recovery. Dissolve up to 1 teaspoon of salt per gallon of water. Treat for 10-14 days then reassess fin condition.
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Related Answers from Veterinarians

  • Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on January 6th, 2019

    The best you can do is to maintain pristine water quality and proper temperatures. If she is not a salt sensitive species, you can use plain aquarium salt (NOT table or Epsom salt) as a general tonic. It can reduce stress, improve gill function, treat minor infection/injury and aid in any recovery.
    Dissolve 1 teaspoon of salt pr gallon of water in a cup or two of tank water. Gently pour it into the tank. Treat for 14 days then reassess the condition. Perform partial water changes afterwards to reduce salinity. Use only conditioned water that is temperature matched to prevent further stress or shock.

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    1Pet Parents found this answer helpful

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