rats and fish will freeze to death below 12 ℃. They belong to wide-temperature fish, and they will grow healthily in water between 22-26 ℃. Their optimum temperature is 26 ℃. Therefore, for general family feeding, the water temperature in the fish tank should be kept at about 26 ℃. However, it should be noted that they should not be heated to too much temperature at one time, otherwise they may have uncomfortable reactions.

The rat fish needs a heating rod. Because their optimum temperature is 26 ℃, if the temperature is too low, they will probably freeze to death. Especially in cold winter, the temperature in winter is relatively low, if you don't use heating rods, it will increase their illness rate. Therefore, two heating rods with good quality should be prepared to heat the water in the fish tank.

Two heating rods should be placed on both sides of the fish tank respectively, and the heating temperature should not be too high at one time. It is better to raise the temperature by 1 ~ 2 ℃. At the same time, the thermometer should be put into the fish tank to pay attention to the change of water temperature at all times. In addition, they can be warmed with hot water. Pour the hot water slowly into the fish tank. The temperature of the new water is 1-2 ℃ higher than that of the old water.