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Freshwater Topics - Plenums
Written by Steve Windsor
At PFK we've been tossing around the idea of a freshwater plenum tank - that is a set-up relying on the "plenum" - a gap under a substrate - to filter the tank. In the marine world these are generally (though not always) combined with "living" sand - a substrate turned over by the living creatures in it - and usually (but again not always) a protein skimmer which removes a lot of the wastes before they can pollute the tank.
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