Jul 15, 2005 #1 R runway1 Aquarium Advice FINatic Joined Jan 4, 2005 Messages 640 Location So-Cal My filter sock is rinsed often but it's very thick material and It always has that brownish-tan look. Can this be holding NO3's up? I can't seem to get much under 20 ppm.
My filter sock is rinsed often but it's very thick material and It always has that brownish-tan look. Can this be holding NO3's up? I can't seem to get much under 20 ppm.
Jul 15, 2005 #2 Blazeherd2306 Aquarium Advice Addict Joined May 19, 2004 Messages 2,238 Location U.S. How many times do you change out the filter sock per week?