Dr Tim's Aquatics One & Only Freshwater Live Nitrifying Bacteria (128 oz) 1920 Gallons - Dr Tim's $415.99 We store this in a climate controlled environment to keep it fresh - Good for 6 months at room temperature, 1 year at 50°F. Best to keep refrigerated for longest shelf life. One and Only Live Nitrifying Bacteria prevents new tank syndrome by... Add to Cart