What the hell is this???

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This is the mechanical equivalent of a DSB. It is fed by a slow trickle of water. By the time the water reaches the end of the device, all oxygen have been used up and the bacteria need to obtain other means of "breathing". The bacteria breaks down the NO3 to do this. Thus no mor NO3 no more nitrates.

Things are a bit more complicated than explained above, but that is the simple lowdown version.
 
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Provided there is sufficient live rock and water changes are in the region of 10% a week, nitrates are not an issue, so no i wouldn`t see the need for one.
 

Rory

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They definitely work. A long tube also works though... Even a bucket of sand works...
 
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From my travels of seeing other setup's, it looks like you could almost run a tank without skimmer, LR, DSB and maybe even water :whistling:
 

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