Arcadia bio phos 80 is a high capacity synthetic iron hydroxide suitable for use in any aquarium with a ph of between 5 and 10r arcadia bio phos 80 has a capacity ranging from 80gkg to 40gkg po4 this is dependent on water conditionsr it is low dust and high density so as to ensure the very minimum of migration from the reactor to the aquariumr directionsr because of the relatively small grain size bio phos 80 is best suited for use in a media reactor or an area of high flow in a fine