- Great for Bubble Nests and Spawning - Provides Hiding Spaces for Fry - Naturally Adds Tannins and Humic Acid - Anti-Fungal and Anti-Bacterial Properties - Great for Freshwater Shrimp - Ideal for Betta and Biotope Systems Nature Box contains Indian Almond leaves, sliced Catappa almond bark, and Casuarina cones, each giving a unique application of tannins, humic acid, and habitat. Each provides tannins, lowers pH, has anti-fungal and anti-bacterial properties, enhances coloration and increases spawning behavior. Directions & Dosage Use one small leaf per gallon Use one bark stick per 25 gallons - lasts about 3 weeks Use 1-2 small cones per gallon Add directly to aquarium or pre-soak for faster sinking. Replace when tissue is decomposed or consumed.