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Not to burst your bubble, but those are copepods and amphipods, which would grow in any established tank, regardless of substrate. Especially a planted tank...
I use a pretty deep layer of pool filter sand, but I use my python to clean it with water changes... Left side of the tank one week, right side the next week... I guess this goes against your wanting a layer of anaerobic activity at the bottom, like you would get with a DSB, but that is not my goal... I wanted a somewhat DSB strictly for aesthetics...
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