- 1). Attach the aquarium heater to the side of the aquarium's interior. It should attach with its included suction cups. Place the heater somewhere where it will be unobtrusive, like in the corner where the fish won't constantly be brushing up against it. The size of your heater will depend on the size of your aquarium; consult the heater's packaging for proper sizing.
- 2). Install the aquarium thermometer. Most digital thermometers are waterproof and attach to the interior wall of the aquarium with a suction cup. Other digital models sit outside the aquarium and use an external probe to measure the temperature. You can also use a stick-on thermometer, though these won't be as accurate or as easy to read.
- 3). Attach the end of the aquarium heater's power cord to the input plug of the lamp dimmer, then plug the lamp dimmer's plug into a power outlet. The dimmer will restrict the amount of power going into the aquarium heater, allowing you to essentially control the water temperature.
- 4). Calibrate the water temperature as you see fit by carefully watching the thermometer as you adjust the power to the aquarium heater until it reaches your desired temperature.
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