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We suggest a target rate of .02-.05 with some arguing lower levels are better. Please test with a reliable test kit. Gfo is typically used in a media reactor, but a media bag in the sump will work, just not as effective as water does not contact every side of the granuals. Remember to change the media as needed. Use 1 cup per 60-70 gal of aquarium water. Net wt 200g.