100% brand new and high quality Features: This product can effectively remove fish waste, removal of nitrates, phosphates, red moss, etc., to improve water pollution. . This product is particularly suitable for use to open a new tank. It help the tank quickly produce beneficial bacteria. New tank every 100L water use 2 piece. NOT use too much, and suggest after it putted, turn on the air pump And every 7-10 days, use 1 piece per 100L water. Specifications: Material: Drug Bottle size: app.4x8.5cm/1.57''x3.35'' Color: As the picture shown Quantity: 1 Bottle(60Pcs) Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Nitrifying Bacteria (without retail package)