When the weather suddenly turns cold, will the heating rod cause the guppies to die?

The survival temperature of guppies is about 22 -28 degrees. In fact, guppies with strong resistance can live in water around 18 -3 1 degree to some extent. We usually adjust the heating rod to about 25 -26 degrees to ensure that guppy can play and eat comfortably in the fish tank, because the temperature near the critical point will cause guppy to have some abnormalities, such as loss of appetite, hunger strike and slow swimming speed.