Biological filtration media are like condominiums for bacteria.
Ceramic rings biological filter media.
Zeovit is part of a specialized system to maintain ultra low nutrients.
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They simply provide a home for the bacteria that do all the hard work.
While fluval recommends these filters be replaced every six months they tend to last considerably longer.
Keep in mind that some of these materials can also be used as mechanical media.
Fluval s biomax filter media consists of porous ceramic rings that are designed to optimize surface area and support growing bacteria populations.
Bio pellets are a plastic media that house and feed bacteria.
The micropores have a mild tendency to clog but can easily be clean and replaced.
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Ceramic rings don t filter your aquarium.
Many hobbyists use highly porous ceramic plates or bricks housed in the sump.