I don't have a large tank yet but with my 70 and my HQI nano I only burn about $17/mth. I did get a Kill-o-Watt Meter and check all my devices though when I set things up and I had a quietone pump that was pulling 3x what they said it would. I got it replaced and now it reads really close to what it should.
Beyond the lights, I think it's often the big returns that gobble up power on your large tanks.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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