Product Review

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.