goldfish need to install a heating rod in winter, because the temperature in winter in China is low, and it is below 0 ℃ in most areas. Although goldfish can accept a wide range of temperatures, they can also grow in low temperature environment. But if the temperature is too low, their growth and development will slow down. If the water temperature is too low, it may cause them to die. Therefore, breeders need to install a heating rod to keep the water temperature in a stable range.

If the breeder can move the goldfish to a warm room, the breeder can not install a heating rod on them. Because indoor heating is generally available, goldfish can spend the winter safely as long as the temperature is above 10 ℃.

Goldfish do not need filters in winter, because the function of filters is to slow down the deterioration of water quality. In winter, goldfish's metabolism itself is relatively low, and the pollution to water quality is not serious, so breeders do not need to install filters for them. Of course, if the density in the fish tank is high or the breeder changes water less frequently, it is best to install a filter for them, which can keep the water quality clean and reduce the growth of bacteria. After entering winter, breeders can change water once every 5-7 days, and the amount of water change each time can be controlled at one quarter of the total water volume.