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What to do if your Betta fish is lethargic and losing color?

Updated On September 23rd, 2025

Pet's info: Fish | Betta | Male

Hi, I have a Betta fish and it is very low on energy level these days and it is losing his color.

2 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on November 30th, 2018

Bettas are tropical fish. They need warm water. They do best between 78F and 80F.  Clean water is key in treating any infection. Check water chemistry using a home test kit or by submitting a water sample for testing. Aim for 0 ppm ammonia and nitrites with a 40ppm or less nitrate level. Perform partial water changes to stabilize chemistry and maintain water quality. Use only aged or conditioned water that is temperature matched to prevent stress or shock. A bit of aquarium salt (NOT table or Epsom salt) can be used as a general tonic to reduce stress, treat minor infection and aid in any recovery. Dissolve 1 teaspoon of salt per gallon of water in a cup of tank water and gently pour it into the tank. Treat for 10-14 days then reassess fin condition. More water changes can be done afterwards to reduce salinity.

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Other Answers

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on February 18th, 2018

    Check the water chemistry/quality. This can be done using a test kit at home or by submitting a water sample for testing. Most pet stores will do this for free or for a small fee. Aim for 0 ppm ammonia and nitrites. Elevated levels of either can be toxic to Opie. The nitrate level can be 40 ppm or less. Partial water changes can be done to stabilize chemistry and improve water quality. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Bettas do best between 78F and 80F. Use a submersible heater if necessary. Diet can also affect coloring. Hikari and other makers offer pelleted diets that may enhance colors. Look him over for sins of illness (redness, sores, swelling, black spots, etc.) or injury such as frayed fins. A bit of plain aquarium salt (NOT table or Epsom salt) can be used as a general tonic to reduce stress, improve gill function, treat minor infection and aid in recovery. Dissolve 1 teaspoon of salt per gallon of water in a cup of tank water and gently pour it into the tank. Treat for 10-14 days then reassess the condition.

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