Live Nitrifying Bacteria for Freshwater Aquarium U4606

One and Only Live Nitrifying Bacteria removes toxic ammonia and nitrite, instantly working to prevent new tank ‘syndrome by establishing a biological filter in your newly set-up aquarium. Use when setting up a new tank, after a disease treatment or water changes. 2 oz size for freshwater aquaria up to 30 gallons. One and Only has no sulfur or other offensive smells. Made by the recognized expert in aquarium nitrification and microbiology.