I have an Aquatop heater for my 44 gallon tall pentagon tank. In the instructions, it says to put the thermometer on the other side of the tank from the heater. If I want the temperature of the water to be 76, do I set the heater to 76? Or do I set it higher so that it is 76 on the other side of the tank? Does this make sense? I assume the water right next to the heater is warmer than the water on the other side of the tank, thus they recommend the thermometer being on the other side. But I'm not sure what I am supposed to do when I am aiming for a tank of 76 degrees. Thanks!