Do goldfish need cold water or warm water?

Goldfish are cold-water fish, meaning that they prefer water temperatures between 65-75 degrees Fahrenheit. In the wild, goldfish live in ponds, lakes, and rivers where the water is typically cool and oxygen-rich. Goldfish that are kept in aquariums should have a water temperature that is within the same range as what they would experience in their natural habitat. In general, the best way to ensure that goldfish are comfortable and healthy is to keep their water temperature between 70-74 degrees Fahrenheit.