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I am thinking of getting a Nanocube 12Gal Deluxe. It has 48w total which would be 4wpg. Is 4WPG what I need for corals, etc. Guess my question is what WPG is low, med and high. I see there are moded Nanocube's that go up to 126w. Do you need 126w? 48w? I know the higher WPG = more...