Reef fishes and invertebrates placed into an aquarium, regardless of size, require the same water parameters found in the ocean in order to live, thrive, and reproduce. Reef Life Perfect Balance Concentrated part A contains all necessary major, minor, and trace ions in the proper ratios to maintain proper water parameters in reef systems Reef Life Perfect Balance Concentrated part B is an ionically balanced buffer to part A that increases alkalinity and maintains stable pH. This simple approach to reef care maximizes time spent enjoying the aquarium. Free of phosphates and other undesirable substances