Sep 30, 2012 #1 Mwells Aquarium Advice Apprentice Joined Sep 30, 2012 Messages 19 Location Boise Idaho Can someone please tell me what GFO stands for
Sep 30, 2012 #2 crister13 Aquarium Advice Addict Joined Aug 2, 2011 Messages 3,473 Location Princeton, NJ Granulated ferric oxide.
Sep 30, 2012 #3 OP OP Mwells Aquarium Advice Apprentice Joined Sep 30, 2012 Messages 19 Location Boise Idaho Thank you