Replicates the natural environment of all Rift Valley Lake African Cichlids;A chemically sound blend of salts designed to replicate the natural environment of cichlids;Contains all physiologically essential elements such as magnesium, potassium, calcium, and sodium;Also contains trace elements such as iron, aluminum, and iodide; Does not contain harmful or unnecessary elements such as nitrates and arsenic;250 grams treats up to 675 gallons