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Fish that can tolerate cool water in an unheated basement


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Hi! I want to buy a few fish tanks this coming Black Friday to make a small fish area in my basement. What kind of fish can I keep that will tolerate water down to say, 50 degrees Fahrenheit? I live in New York. I'm willing to use a space heater on the occasional days where the weather is extremely cold, but I can't afford to heat my basement on a continuous basis, nor can I afford to insulate my entire basement. I might insulate one or two fish tanks with rigid foam board, but I would also prefer not to insulate all of my basement aquariums.

Some cold-tolerant fish that I'm aware of:

  • Fancy goldfish
  • North American native fish -- shiners, darters, and sunfish look so cool 🙂
  • The fish mentioned in https://www.aquariumcoop.com/blogs/aquarium/coldwater-fish
  • Uruguayan fish like gymnogeophagus and australoheros which I've read are far south enough in South America to experience cooler temperatures. 

Are there any other cold-tolerant fish species that I should be aware of?



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On 11/2/2023 at 4:35 PM, BenAquatics said:

Are there any other cold-tolerant fish species that I should be aware of?

Not a fish, but axolotls need to be in cold water. They are usually sold small but get fairly large.

I do agree with the previous post that a heater inside the tank should be used also. Cold is ok for some fish, but fluctuating temperatures can be a problem. Try to keep it consistent.

Edited by Chick-In-Of-TheSea
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