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Is it possible to use a chemical media that will remove dissolved wastes except tannins? If I understand correctly, tannins are a form of dissolved organics, so I don't know if there is a resin that can be selective as to what organics it removes?
 

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Prep new water with a bag (nylon stocking) of peat moss.
Then do a water change, emphasizing vacuuming the floor of the tank (as close as you can get with a vacuum), and clean the filter.
With less coarse (partially decomposed) organic matter there will be less dissolved organics.
 
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