Features: brand new and high quality 1. Contains 30 pieces or 80 pieces aquarium nitrifying bacteria capsules. 2. Our product can effectively remove fish waste, removal of nitrates, phosphates, red moss, and etc., to reduce water pollution and improve water quality. 3. Particularly suitable for use to start a new aquarium, for both freshwater and saltwater. 4. It helps the for tank quickly produce beneficial bacteria. 5. For new for tank, use 2 pieces for every 100L water. Do Not use too much. Suggest to turn on the air pump after adding. For every 7-10 days, use 1 piece per 100L water. Specifications: Material: Nitrifying Bacteria Color: As Pictures Show Size: Bottle Size Approx.5x8cm/1.97x3.15in Weight: 30 Pieces-Approx.70g 80 Pieces-Approx.125g Note: 1.Please allow 0-1cm 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: 30 Pieces of Nitrifying Bacteria Capsule or 80 Pieces of Nitrifying Bacteria Capsule