If you have an HQI metal halide light over your tank (I'm assuming you have one of those all in one tanks, Aquapod or whatever, and the MH light that goes with it) it's more than likely enough. Its probably 150W if it's a Sunpod, so you should be good over a tank that small. From what I remember after having seen one, these tanks aren't that deep.
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Calvin
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Planning a 29 gallon mixed reef...
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