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In my 31 inch tank, I'll have an inch at the top and a 5-6 inch sand bed, which leaves me 24-25 inches of water, so at most 23 inches to the top of a clam and less than 20 inches to any SPS, so 250MH 10K and VHO actinic will be fine.
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Click on my red house to see my 390 build thread.
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