I have a Top Fin 25w heater in my 5 gallon tank. See, there aren't temperature indictators near the knob. It just says from 68 to 93 degrees. So, what I usually do when the water is chilly at about 73F or less, I crank the heater up all the way. It takes about an hour and it will be 78F or so. Then it will drop over time, so I have to keep turning it on and off.
Do I just leave it at the point where I want it and never turn it off? I'm afraid my fish will go into shock from the changing temperatures.
Do I just leave it at the point where I want it and never turn it off? I'm afraid my fish will go into shock from the changing temperatures.