DrTim's Aquatics One and Only Live Nitrifying Bacteria for Cycling Reef and Nano Aquariums, 4-Ounce
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.  Great to use in a reef tank starting with dead rock.  Use when setting up a new tank, after a disease treatment or water changes. 4-Ounce size for saltwater aquaria up to 60-gallon. One and only has no sulfur or other offensive odors.  Made by the recognized expert in aquarium nitrification and microbiology.