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How to make a cichlid tank safe for a goldfish after fish died?

Updated On September 23rd, 2025

Hello! Things didn’t go so well with cichlids and I only have one remaining which I moved to a different tank. The 45 is now empty and the others besides one blue African cichlid has died. I did water tests and most came out fine except the Carbonate hardness which was at a 40. (That’s bad as far as I know if you could clarify that would be great) but I have a goldfish that would do great in there but I’m very attached and I don’t want anything to happen to him as well any idea of what I can do?

2 Answers

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on September 26th, 2019

Water conditioning can be complicated and I recommend to stop by your local aquarium store. They are most often familiar with the local water quality and can give recommendations specific to your location. Some areas need buffering solutions to help control things like the water pH. Here are a few links which may help answer some of your questions about water condition: https://www.aqueon.com/articles/freshwater-aquarium-water-quality https://www.petcoach.co/article/aquarium-water-management-alkalinity-vs-water-hardness/ Before moving your goldfish, make sure all the conditions are appropriate for goldfish: https://www.aqueon.com/information/care-sheets/goldfish https://www.petcoach.co/article/how-to-help-your-new-goldfish-thrive/ I hope this helps and please feel free to post any additional questions.

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Other Answers

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on

    Goldfish are very adaptable and do well in either hard or soft water. Maintain stable water chemistry and temperature. Aim for an absence (0 ppm) or ammonia and nitrites with nitrates at 20 ppm or less. Confirm your filter is rated for at least twice the volume of the tank. Maintain water temp between 65 F and 72 F.

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