Fluval G3 Tri-EX Cartridge

This filter does what it says. Before using this, however, you should first run the Phosphate and the Nitrate filters for a day each. This brings the levels down to "manageable" levels without using up the Tri X. Remove them and store for later use in an emergency situation. The Tri X will then maintain the levels for a long time. I am using it on a 75 gallon tank with live plants and 24 fish (Gouramis, Tetras, Barbs, Platys, Danios, Corys).

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