My local fish people I talk to said 2 heaters in a "medium" size big tank really don't do nothing to help the power bill or add any pluses. I got 2x 300w Jagers going in my 120 thinking it will heat faster and distribute evenly. Once desired temp is reached it also doesn't take much ON time to get it back to the temp again. Seems 1 will strain heater no matter what the heater is rated for
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Sent from my iPod touch using MonsterAquariaNetwork app