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Freshwater? Saltwater? What kind of corals/plants do you want to grow? If you are not growing plants or corals 120W is total overkill. You can light that tank with <20W very satisfactorily.
It will be a reef tank when I'm done purchasing all of my equipment. Just getting back into aquarium keeping after a 15 year hiatus. Holy expensive... Thanks for the words of wisdom. I'm sure I'll need more advice along the way.