Kent Marine Super Chelated Iron Supplement with Manganese provides bio-available iron to all reef inhabitants. Although present in salt mixes, iron is rapidly used up in the system, and removed through precipitation. Super Chelated Iron Supplement supplies needed iron, manganese, potassium and minor trace minerals for proper growth and health of caulerpa, coralline, and other calcareous marine algae, and those invertebrates which have symbiotic algae living in their tissues. It contains a chelated form of iron which will stay available in the system for long periods of time, supplying algae in a timed release fashion, as needed. It contains no fertilizers which can spur unwanted hair algae or other undesirable growths. Kent Marine Super Chelated Iron Supplement is a proven performer in the difficult marine environment!