guppies can live normally at 18 ℃, because although they belong to tropical fish, they can accept a wide temperature range, and guppies can live to normal life at 18 ℃. Although guppy can survive normally in the water temperature of 18 ℃, if the breeder has the conditions, it is best to install a heating rod to keep the water temperature between 23-28 ℃. In this temperature range, their growth state is the best, and their physique will become better and better. Moreover, a heating rod is installed, which can keep the water temperature constant and avoid the influence of temperature difference on their growth and development.

The minimum acceptable water temperature for guppies is 13 ℃. Although they are tropical fish, compared with other tropical fish, they can accept a wider temperature range. As long as the water temperature is above 13 ℃, they can grow normally.

Although guppies can accept a wide range of temperatures, they can also accept lower water temperatures. However, breeders should try not to control the water temperature in which they live at the lowest temperature, because in a low temperature environment, their physique and resistance will decline, and their growth state will gradually deteriorate. If the breeder keeps them at a water temperature of about 13 ℃ all the time, their life span will also be affected, and they will also get sick and die.