turn the heater right down
then turn it up one degree
at a time till the light comes on
then turn it one degree back and
you might find thats were it needs to be set
Erm, yeah ive tryed that and ive got it so its kinda set on 80 but im keeping a good eye on the tank, as i dont really trust it lol
heaters do have a thermostat built in
it will cut off and switch on when it
either gets to cold or to hot it will
not show up on a thermometer exactly
what you set it for unless the heater
as been compromised or is damaged
in some way
The heater is fine but im doing it with caution as i dont want to risk killing my fish