12-06-2009, 10:24 AM
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The most important thing about the filter is that it be suitable for the aquarium in terms of the inhabitants.
In a planted tank, you do not want excessive water movement which is detrimental to plant growth (as I've explained in other threads). You also need to consider the needs of the fish; forest fish require quiet water, as little movement as possible for most of them. Fish from flowing streams need a bit of current to feel safe and be less stressed. Then there is the matter of bio load; the filter must handle the fish load, and this is more critical in non-planted tanks where there are no plants to filter the water.
The filter recommended for a particular size tank is not the important criteria if the way the filter works does not suit the fish.