Flourish Tabsª are tablets designed to be inserted in the gravel of a freshwater planted aquarium to provide a source of important plant nutrients (see Guaranteed Analysis for complete listing). Guaranteed Analysis: Total Nitrogen (N)ÉÉÉÉÉÉ 0.28%, Available Phosphate (P2O5) 0.17%, Soluble Potassium (K2O)ÉÉ 0.16%, Calcium (Ca)ÉÉÉÉÉÉÉ 14.9%, Magnesium (Mg)ÉÉ..ÉÉÉ 0.06%, Sulfur (S)ÉÉÉÉ..ÉÉÉÉ 12.2%, Boron (B)ÉÉÉÉ..ÉÉÉÉ 0.029%, Chlorine (Cl), MaximumÉÉÉ 0.55%, Cobalt (Co)ÉÉ.......ÉÉÉÉ 0.001%, Copper (Cu)ÉÉÉ..ÉÉÉÉ 0.001%, Iron (Fe)ÉÉÉÉÉÉÉÉÉ 2.2%, Manganese (Mn).......ÉÉÉÉ 0.23%, Molybdenum (Mo) ..ÉÉÉÉÉ0.0009%, Sodium (Na)ÉÉ.....ÉÉÉÉ 0.14%, Zinc (Zn) ÉÉÉÉ.....ÉÉÉÉ 0.0024%. Derived from: Potassium Chloride, Calcium Sulfate, Copper Sulfate, Magnesium Chloride, Ferrous Gluconate, Cobalt Sulfate, Magnesium Sulfate, Manganese Sulfate, Boric Acid, Sodium Molybdate, Zinc Sulfate, Amino Acids.DIRECTIONS: Insert one Flourish Tabsª in the gravel for every 10Ð15 cm (4Ð6 in.) radius. Tabs should be replaced every three to four months. Tabs will not - UPC: 116050500