Use 100mg sealed mesh bag (typically requires changing every 4 months in the 46l/12g FluvalEdge™) PhosGuard™ rapidly removes phosphate and silicate from the water. The general consensus is to limit phosphate (as PO43-) to lower than 0.05 parts per million (ppm) for reef aquariums. This can be achieved in a variety of ways, but using media such as PhosGaurd™ to adsorb phosphate may be necessary for some aquarists.
This product is highly recommended for new tanks as it will help control nuisance algae that often occurs in the early stages of your tank’s development as it is still establishing itself. Note: Some people prefer to use granular ferric oxide media (GFO) for phosphate removal. If you prefer to use GFO you will need to purchase a sealable mesh filter media bag and fill it with a GFO filter media.