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. Add 1 teaspoon (1 capful or 5 ml) per 50 gallons (190 l) every week or 8 drops each day in normal systems. If particularly trying to grow caulerpas or other macro algae; Super Chelated Iron Supplement can be used at up to 3 times the rated dose; very safely.