100% natural and organic farmed. Used as invertebrate feed and feed additives. Liquid nutrition for live corals, polyps and all filter feeding invertebrates. Invertebrate Nutrition: Take a cup of clean water and mix pinch of Spirulina powder to make a liquid nutrition for live, corals, polyps and all filter feeding invertebrates. Turn off all your pumps and pour this liquid spirulina in the aquarium tank.