04-09-2011, 12:52 PM
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I concur with Mikaila.
Filters, no matter what type they are, move the same water around. Yes, depending upon the type they may alter the water chemistry or do this or that to the water, but they do not remove and replace the water. And all fish occur in water in nature that is constantly being replaced, not to mention the biomnass of fish to water volume in nature far exceeds any aquarium.
Some planted tank sources will suggest infrequent water changes, even only once or twice in a year. But this is misleading. For this to work, the tank must be very heavily planted, and contain a very minimal fish stocking. I recall once reading that a group of 8 Neon Tetra
in a very heavily planted 55g aquarium would be the maximum fish load/water volume ratio to achieve this. I am not saying this is or is not accurate; I only mention it to emphasize the point that the fish load must be minimal in order for the plants to handle it without water changes.