Fluval Biological Enhancer Aquarium SupplementFluval Biological Enhancer Aquarium Supplement is a fast acting, powerful army of beneficial bacteria that immediately inoculates aquarium water to create a safe environment for your fish. This all natural product eliminated toxic ammonia and nitrites to maintain a well balanced environment and prevent fish loss. Prevents fish loss Establishes a safe aquarium environment Eliminates ammonia and nitrite Safe for fresh and saltwater Fluval Biological