04-25-2010, 07:12 PM
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They are filter feeders. They would filter organics out of the water, but I would worry about the abundance of food available to them. Also some species have parasitic larva that will effect your fish if you by chance achieve breeding. They don't really do natrual filtration though. They eat food and produce waste just like any fish, snail, or invert. Even if they didn't filter out the organics in the water they would still break down into wastes and be converted by the filter. The only real natural filtration for freshwater are plants.