Heaters
When choosing a heater for your aquarium you must keep a few things in mind. The general rule is 3 to 5 watts per gallon of water. Another thing to keep in mind is that it is always good to keep a extra heater on hand should one ever fail.
There are three ways that the heaters can be used in your tank. There is the HOT or hang on tank heater, then there is the submersible heater and finally the external heater.
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