well you'd need to know what power heads and how many watts they draw. as well as the watt usage of the mag 2 and the sedra 3500 on the skimmer. these numbers are usually on the back of the units. A thought on how to reduce usage is to drop down to 2 VHO's. maybe also get 2 effiecent power heads instead of 3 and maybe run the skimmer a little less depending on Bio load and coral content.
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