I have a Kill-a-watt meter that I plugged my tank's power strip into. Since I have fairly efficient lights, I was surprised at first to see that everything was drawing 127 watts. Then I remembered that my 100w heater was, in fact, using 100w.
In the push for efficient lights in the hobby, we forget about the cost of maintaining tropical water temperature. Pushing your tanks together to create a heat mass, insulating the non-viewing sides, as well as using a tight cover to prevent evaporation are all pretty basic solutions. If it doesn't fit with your goal of having a 360-viewable open-air tank, fine. Otherwise, a little polystyrene insulation board can save bucks.
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