Aquarium Nitrifying Bacteria Starter S662

Improve the water in your aquarium with Top Fin Readistart Nitrifying Bacteria Starter. Perfect for start-up and maintenance, this product allows for the immediate introduction of fish and naturally reduces ammonia. Use when setting up a new aquarium, performing a water change, adding new fish, changing filter media, after medicating, or when ammonia or nitrites are detected. Only at PetSmart.