07-21-2013, 07:22 AM
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The reason that Deep Sand Beds work in Saltwater aquariums is because of detrivores, microorganisms that feed on detritus and such, and anaerobic bacteria. The deepest part of the sand bed, in a saltwater aquarium 4-6", harbors anaerobic bacteria that convert nitrates into nitrogen gas which leaves the system naturally. Above that layer are detrivores, who move the sand around all so slightly to keep it from crystalizing and clumping together, or from Hydrogen Sulfide pockets from forming.
In Freshwater, I do not think that these detrivores exist. Freshwater burrowing wormlike creatures are a lot larger, and will probably disturb the anaerobic layer that harbors the anaerobic bacteria necessary for a Deep Sand Bed to work.
Read this: Ron Shimek's Website...Deep Sand Beds
Maybe you should start a saltwater tank? lol