As 2010 rolls around I would like to start a discussion on the DSB (Deep Sand Bed). What do we know about them at this point in time? Here are some questions I have to seed this discussion: 1. What are the latest findings in regards to implementation of a DSB? Who are the authorities in this field? 2. What physically constitutes a DSB? For instance, Sugar Sand + x" deep in an x gallon tank/container. 3. Water Flow: What kind of flow should a DSB have? Slow? Fast? Steady? Intermittent? Recirculating? Why is this important? 4. What organisms should be allowed to live within or on a DSB? 5. How do you test a DSB for effectiveness? What are signs of success? 6. What sort of maintenance does a DSB require? 7. Who out there has a working DSB? Meaning a Ammonia -> Nitrite -> Nitrate eating Nitrogen Gas Producing sand bed. How is yours implemented and how did you achieve this success? All feedback is welcome and encouraged.