Reef Phytoplankton, 2 L / 67.6 fl. oz. A concentrated blend of green and brown marine phytoplankton Natural source of carotenoids for coloration; Enhanced to increase the bioavailability of important nutrients such as protein, lipids and others No refrigeration required and no added dyes or synthetic pigments Blended with the proper ratio of fatty acids, carbohydrates, and proteins thus corals expend less energy to derive nutritional benefit Provides essential fatty acids, proteins, vitamins, amino acids, with biological carotenoids for invertebrate diet