Fritz Dark Water Almond Leaf Extract is a natural water conditioner containing concentrated tannis from the leaves of the Terminalia catappa tree also known as as Indian Almond Leaves. These tannins create a more natural environment for Bettas; shrimp and other fish. Almond leaves contain humic acids and tannins which are known to have antibacterial properties; naturally lower pH and create blackwater conditions in the aquarium. Fritz Dark Water Almond Leaf Extract is suitable for all soft-water fish including betta; discus; tetras; angelfish; and killifish. FR11112 Casebuy:12.