01-10-2007, 10:38 PM
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ok. This is very important so read carefully
As you obviously know the tanks "good" bacteria live on your gravel, ornaments etc it is not enough to sustain a proper amount to keep your tank without any ammonia. This is where the filter comes in. Bacteria will live in the filter media (filter media is what you use in your filter). It is important to have part of the filter never taken out and thrown away. This filter part is called the bio-medium. Good filters are ones that have 3 way filtration. Lets use a power filter as an example. The bottom part of the filter will be used for mechanical filtration (where debris is filtered out) the mechanical filter should be changed monthly. The middle part of the filter is a bag containing activated carbon. This is called the chemical filtration (the carbon asorbs impurities) you change the carbon monthly. The top part is the bio-medium It is where the bacteria should live, you should never change this.
Another good form is called a bio-wheel. This wheel sits at the end of the filter. It is never changed and it is a good house for bacteria.
There should be at least one part of the filter that doesnt need to be changed at all.