hey guys im gonna upgrade my 10 year old 200 watt visi-therm heater. i would like to run 2 heaters as a fail safe. should i go with 2 100 watt heaters or 2 150 watt heaters? i was looking at these ones Amazon.com: Cobalt Brand Plastic LED Neo-Therm Heaters for Aquarium, 150-watt: Pet Supplies
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