Directly Adjustable Control Stem Waterproof Closure Fahrenheit and Celsius Scale Long-Life Power Lamp Tubular Glass Heating Element Shock Resistant Borosilicate Glass Tube Complete Range of SizesCompact Sizes and Wattages:6" length - 25 & 50 watts10" length - 75 & 100 watts12" length - 150 & 200 watts14" length - 250 & 300 wattsChoosing the right size heater:A good rule of thumb is multiply your tank gallon size by 5 (example 30 gallon tank needs a 150watt heater). Keep in mind where your tank is located. ie: cold room or warm room and adjust acordingly.
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