Ultimately I wouldn't think that 2x150W will work all that well for sps in a 90 gallon tank unless they're all at the very top of the rockwork/water and that doesn't leave much room for growth sometimes. Using the single pendant will at least give you about 12 inches directly underneath and then probably another 4 or so on either side. What about getting a second pendant?
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Christy's Reef Blog
My 180 Build
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