Feature: 1. [Bacteria Culturing] Aquarium bacteria ball removes harmful substances through parasitic nitrifying bacteria and has a certain adsorption effect. 2. [Efficient and Quick] Aquarium filter media can quickly remove harmful substances in the aquarium, such as nitrates, nitrites, ammonia, etc. 3. [Stable pH] Fish tank bio filter media stabilize the pH of water and can be reused for long periods of time. 4. [Water Purifying] Aquarium bacteria ball filter promotes water decomposition and purifies water. 5. [For Marine and Freshwater] A perfect biological filter media to use for sump tanks, marine and freshwater fish tanks, and canister filters. Specification: Item Type: Aquarium Bacteria Ball Material: Bacteria Balls Use: Aquarium, Fish Tank Filtration Net Weight: Approx. 800g / 28.2oz There is 0-5g error.. Package List: 1 Bag x Aquarium Bacteria Ball (Mixed Color) Note: There is 0?5g error.