What’s the Ideal Temperature for Goldfish in a Tank or Pond?


Goldfish, a member of the Cyprinidae family and one of the most popular aquarium fish, are indigenous to Eastern Asia. They are not the same as carp but are linked to them and were domesticated from food fish for the first time in China over a thousand years ago. Koi and common carp can be identified from goldfish by the latter’s lack of “whiskers” or barbels in the corners of its mouth. Today, numerous “fancy” goldfish strains with various body forms, colors, and fin kinds have been developed through selective breeding. They include butterfly tails, pearl scales, wakins, lion heads, ranches, oranges, ruins, telescopic eyes, heavenly eyes, bubble eyes, oranges, fantails, ranches, and many more.

Natural Goldfish Habitat

In nature, goldfish can be found in practically all freshwater habitats, including rivers, streams, lakes, ponds, reservoirs, and settings from the tropics to the temperate zones. In several regions of the world, they have been introduced to reduce the number of mosquitoes.

Water Requirements for Goldfish

Goldfish, which are thought of as cold water fish, may also be kept in heated aquariums. Fancy goldfish should be kept between 68 and 74 degrees Fahrenheit, whereas comets and shubunkins should be kept between 60 and 70 degrees. Although pH is not essential, it should preferably range from 7.0 to 8.4. Rapid changes in water chemistry or temperature can affect goldfish or even be lethal. You can also add a tablespoon of aquarium or sea salt per 5 gallons to keep goldfish healthy. Use an Aqueon Aquarium Water Changer or Siphon Vacuum Gravel Cleaner to maintain adequate filtration and replace 10% of the water each week or 25% every two weeks. Before refilling your aquarium, remember to treat the tap water with Aqueon Water Conditioner!

Goldfish Housing Requirements

Never keep goldfish in bowls, tiny aquariums, or any other unfiltered container! They grow to be fairly huge and produce a great quantity of waste, which can be dangerous if allowed to collect, in addition to having rather high oxygen demands. They are known to withstand relatively cold winters and make great outdoor pond fish, including common goldfish, comets, and shubunkins. Orandas, ruins, moors, and other fancy goldfish can also be kept in outdoor ponds, but they are more prone to predators and need to be taken inside during the winter in cold climes. Adult common goldfish, comets, and shubunkins in aquariums should each have at least 20 gallons of water, As opposed to adult fancy goldfish, which require at least 10 gallons per fish. When goldfish are housed in warmer environments, more aeration is advised in addition to a somewhat bigger filter to accommodate increased waste output. With the probable exception of Cryptocoryne, Java fern, and Anubias—although they may also uproot these—larger goldfish will devour a variety of living plants. The fragile fins and eye sacs of bubble eyes, celestial eyes, moors, and telescopes may be torn by decorations with sharp edges and abrasive rocks like lava and tufa. Avoid using jagged or shattered glass gravel since goldfish prefer to forage in the substrate. Ensure sufficient water flow while avoiding severe currents.

Cold Water Fish Are Goldfish

Remember that goldfish are cold-water fish before reading about the recommended water temperature for goldfish. In terms of biology, goldfish can tolerate colder water temperatures better than tropical fish. In actuality, goldfish can endure colder than 50 F before hibernating or developing health issues.

This does not imply, nonetheless, that you ought to keep these resilient fish in water that is too chilly. Depending on the season, goldfish kept in outdoor ponds may endure a wide range of temperatures, but it’s crucial to make sure the pond doesn’t freeze over in the winter.

What Takes Place If You Don’t Keep It Comfortable?

Your goldfish may get lethargic and stop eating if the water in your pond or goldfish tank is too chilly. Because goldfish are more sensitive to parasites and diseases in cold water, you run the danger of doing so. In extreme circumstances, goldfish exposure to cold water can even result in death.


In conclusion, your climate, the sort of fish you have, and whether or not you are breeding will all affect the appropriate water temperature for goldfish. Though some species may withstand larger temperature variations, you should generally keep the water between 68 and 72 degrees Fahrenheit.

We hope this post was useful to you. Please feel free to leave any questions or comments in the space provided below. Check out our other articles if you want to learn more about caring for goldfish. Regarding your goldfish, good luck! Thanks for reading!

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