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Originally Posted by DavidDoyle @ Sat Jan 29, 2005 2:36 pm
Adding filters to a tank does not increase the size of the bacteria colonies, it will spread them out. The colonies always size to the available food source. The bateria live on all the hard surfaces in a tank with the greatest concentraion where the best source of food and oxygen occur (ussually the filter).
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It does provide an easy to move source to jump start you bio filter though, which is the whole point of using an extra sponge filter.