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Think it depends on how much flow you are shooting for and if you think it will be a struggle to keep sand from shifting all the time. Easier to keep detritus off bottom without sand. Personal preference, I like the way a thin layer of sand looks, plus the added organisms and fish that enjoy a sand bed. Did a deep sand bed years ago on first tank and was hard to control nitrates. Of course probably had many other issues with that tank.If sand then how deep?