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it really depends on what you want to keep - I currently have the exact same fixture as you have on my 75g and have great success..
i keep a green digi SPS.. granted its about an inch from the top
i have hammers, leathers, devils hand, blastos, rics, monti cap all under these lights. i do suppliment the lack of lighting with over feeding and heavy heavy skimming. But i get by.
I do plan to upgrade to 2 250w HQI's. But this gets me by. Think about what you want to keep and make a determination.
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