Two Little Fishies Strontium Concentrate 250 ml. (8.4 fl.oz).Strontium ConcentrateJulian Sprung's Reef FormulaFor aquariums with dense growth of reef building corals, this supplement provides an extra boost of strontium that enhances the deposition of calcareous skeletons.Does not contain molybdenum, which can promote cyanobacteria.Supplies strontium for the growth of stony corals and coralline algae. Made from a pure source (ACS grade) of strontium chloride. Very concentrated - a better value than the competition.About Two Little Fishies,Two Little Fishies, Inc. was founded in 1991 to promote the reef aquarium hobby with its introductory video and books about reef aquariums. The company now publishes and distributes the most popular reef aquarium reference books and identification guides in English, German French and Italian, under the d.b.a. Ricordea Publishing.Since its small beginning, Two Little Fishies has also grown to become a manufacturer and importer of the highest quality products for aquariums and water gardens, with international distribution in the pet, aquaculture, and water garden industries. Two Little Fishies¿ product line includes trace element supplements, calcium supplements and buffers, phosphate-free activated carbon, granular iron-based phosphate adsorption media, underwater bonding compounds, and specialty foods for fish and invertebrates. Two Little Fishies also offers beautifully engineered plastic fittings used for air and water plumbing in aquariums, water gardens and paludariums.It is our company mission to manufacture and distribute products of the finest quality that are simple, elegant, practical, and useful. By providing these intelligent solutions and publishing the latest information about how to build successful and beautiful aquariums, we enhance everyone¿s enjoyment of their aquatic hobby. This way we build a following of happy successful customers.