Hi Invigor. In the lower regions of the sand bed, you will reach an area that is oxygen depleted. In this area the first group of bacteria that populate it is SRB's Sulfide reducing bacteria, they are not toxic but the byproduct they produce is very toxic. So stiring deep into this area can cause alot of harm to your critters above.
The concept of Aquarium Composting (DSB's) is that bacteria reduce nitrogen based products and cycle everything else. Bacteria are the only critters in the bed that do this. The larger critters such as snails, worms and so on are thier to help migrate the different forms of nitrogen and other products through out the bed (basically they create the pathway).
According to the experts and starters of the dsb fad, a 6 inch DSB in a 100 gallon tank will be able to provide nitrogen filtration for 3 to 4 small fish and 4 to 5 corals. So you can adjust these stats to what ever tank size you have. In most peoples tank this does not meet the kind of filtration they need. I know several people that lightly stir the top region of the bed (about 1 inch) and syphon out the detritus that becomes suspended. This method will not release the sulfide (as the sulfide is much deeper) and will help the dsb cope with the extra bioload.
hope it helps
Mike
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