https://www.chewy.com/education/fish/goldfish/proper-goldfish-water-temperatures
*Goldfish are more than beginner pets – they are long lived fish with specific care requirements. The Goldfish Education Hub shares essential guidance on tank size, water quality, feeding, and recognizing signs of illness to support a healthy goldfish habitat.
Goldfish are generally quite adaptable when it comes to water temperature. In fact, most fish are more temperature tolerant than many hobbyists realize - but successful acclimatization also depends on maintaining proper overall environmental conditions.
Goldfish, in particular, can handle a broader range of environmental fluctuations compared to many tropical species.
Goldfish rely on their surrounding water to regulate their body temperature. They absorb heat from the water and also release energy back into it. Because of this, their vital bodily functions are directly influenced by the temperature of their environment.
If your goldfish tank is running at the higher end of the temperature range tolerated by fancy goldfish, it’s wise to boost aeration.
Strong bubbling action not only improves oxygen levels but also promotes cooling through surface agitation and evaporation.
If the water temperature starts to exceed 85°F, consider using a small fan directed across the open top of the tank to encourage additional evaporative cooling.
Also, be sure the aquarium isn’t exposed to direct sunlight, which can significantly increase heat.
Chewy editorial team helps you better understand how to manage temperature and create an optimal environment so your goldfish can thrive.