Solving Algae Problems in Saltwater Aquariums
Granular ferric oxide (GFO) is a chemical designed to inhibit algae growth by removing phosphates from the aquarium. Serious algae outbreak is one of the most common reasons for complete tank shutdown. GFO is an essential tool and should be part of regular tank maintenance.
Phosphate (PO4) comes from fish food, tap water not filtered through an RO system, dead rocks, and activated carbon.
GFO can be used to remove phosphate by either adding into a bag in your tank sump or by using a fluidized reactor. Continuously running your tank water through a reactor or media bag containing GFO will maintain phosphates below 0.03 ppm. Change the GFO each month or when PO4 levels rise above 0.03 ppm.