Seachem Reef Strontium is a high quality formula designed specifically to restore and maintain essential strontium levels to those found in natural seawater, without negatively impacting pH balances. Strontium, much like calcium, holds similar importance in regards to maintaining exceptional growth and development rates. Reef Strontium also encourages the growth of corals, coralline algae, and other organisms that feature a calcareous skeleton or shell. The formula contains 10,000 mg/L of available strontium as a gluconate complex, which significantly increases the bioavailability of strontium and offers a source of metabolic energy for corals. As gluconate contains no nitrogen or phosphorus, it is impossible for the formula to contribute to algae growth in a properly maintained environment. Comes in a 250 ml container.