Join Date: Feb 2010
Location: Fort Lauderdale, FL
GFO in the substrate
In reef aquaria many aquarists use GFO (granulated ferric oxide) to remove phosphates. Once this material is exhausted (i.e. fully saturated with PO4), could one introduce it to a planted tank in hopes that it might provide a continuous (albeit small) contribution of iron and/or phosphates into the aquarium via leeching?
I understand that iron and phosphate form a nearly insoluble compound, but what about in anaerobic areas of the substrate where the iron could be reduced?
Us reef guys don't know jack about plants.