Highly concentrated and nutritious food for corals. Contains omega-3 and omega-6 fatty acids. Extract from selected zooplankton, amino acids, vitamins and carbohydrates. Product does not contain phosphates and nitrates. An addition of copper sulphate reduces the development of zooxanthellae and increases bright pastel colouring in SPS corals. Small amount of Copper sulphate, this will not harm your corals or invertebrates. Dosage: 1 drop for 100l (27 US gal) Every other day when the light is off.