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I use philodendron since they require less preparation and grow faster, absorbing more nitrates, etc. from the water. You simply leave the philodendron in its pot. There are long aerial roots that reach out from the plant. Dip them in the tanks around the plant. The roots fan out in the tank, absorbing fish waste and minerals. The only thing is eventually the philodendron get too large. I have two that are about six feet across and about three feet tall with palm tree-like trunks. A vine version of it is easier to trim and can reach and filter any tank or all the tanks in a large fish room. Like this one" http://www.floridata.com/ref/M/mons_del.cfm Fish don't eat the roots because they have a bitter taste.
 
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