12-05-2012, 06:11 AM
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It seems to me that the real reason for two heaters is to sustain the tank temperature if/when one heater fails. I have a 200w (original) and a second 250w (added) in my 60g.
Typically, the 250w routinely maintains the temp, but if/when the room temp gets low, both will work to maintain the 76-78F temp. If one was to fail, the other is capable of maintaining temp (unless the room tem was to get very low).