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I personally like around 2 inches. Over time the sand will get moved around I have more in some places and less in others. On the home page left hand side about half way down are calculators, one of the is a sandbed calculator. good luck
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Tony
Current Tank Info: 180gal DT, BM NAC77 skimmer,3 Maxspect razors, Maxspect Gyre 150, 30g QT
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