MARIMO PET STORE Shirakura Yellow Micro Organism & White Mineral Powder for Live Aquarium Shrimp Crystal Red Sakura Plant Cherry You are winning 1 Shirakura Mineral Powder & 1 Microorganism Powder Shirakura Mineral Powder For every 50 liters or 14 gallons of water, the first 2-3days sprinkle one spoon. Monitor the pH and add small pinch every day. Shirakura Micro-organism Yellow Powder 2 feet tank 1 flat spoon everyday. 3 feet tank 1 full spoon everyday.