Your gonna need 4. Biggest mistake I see is people not getting enough of them. Once your corals are used to them, which in my case has taken since Sept you can crank them up to 100%. You just have to be patient as you run in to problems with bleaching and brownout. Since ive started to get closer to the 100% mark i've seen better growth and color. I've copied a lighting schedule off of a member on that other site and it's turned out great.
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