Heaters and lights are what draw a lot of power...my 125 gallon tank has 884 watts between the heaters and lights. To compair that is like having 14 lamps going in your house with 60 watt light bulbs! SO, if you can turn out lights except JUST when you want to enjoy your tank it would be good. If it is a planted tank, you should only have to run lights 12 hours a day. To keep algae down it is best to only have them on 10 hours a day any way.
The filters don't take hardly any wattage....My Eheim 2028 canister is only about 30 watts! Air pumps also don't take but about 15 watts, so those are very effecient.
IF you keep your home warm, around 70, your heaters don't run all the time, but you really can't skimp here, for the health of your fish. It's the pits, but what is there to do?
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