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One & Only Live Nitrifying Bacteria (4 oz) - Freshwater - Dr. Tim's Aquatics


Item #: DQ1018

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Get your bio-filter going, instantly, with One & Only.  

One & Only is a live nitrifying bacterial supplement best utilized when setting up a new aquarium, after a water change, cleaning your filtration, adding new fish, or after treating for diseases - One & Only will control ammonia and nitrite by converting any waste via nitrification.

To have a successful aquarium, it is key that fish waste can be converted into a non-toxic form.  Establishing your bio-filter is typically done by allowing nitrifying bacteria to develop by letting your aquarium cycle, which can take weeks after setting up a new tank.  During this cycle the levels of ammonia and nitrite can reach highly toxic levels that can kill fish, a process known to many hobbyists as New Tank Syndrome (NTS).  

It was believed that two particular species of nitrifying bacteria were responsible for converting waste during the cycle, but through Dr. Tim`s scientific research, he showed it to not be the case.  Through this research One & Only Live Nitrifying Bacteria was developed and is now used in public and professional aquariums worldwide.


  • Eliminates new tank syndrome
  • Instantly creates a biofilter
  • Removes toxic ammonia and nitrite, naturally
  • No sulfur or other offensive odors
  • No wait needed
  • 100% natural


  • Shake well before use
  • For best results, use entire contents at one time - it will not overdose
  • Minimum dosage is 10ml per 10 gallons of aquarium water
  • Good for 6 months at room temperature
  • Good for 1 year when stored at 50°F. Best to keep refrigerated for longest shelf life.
  • Note: DO NOT FREEZE - One & Only is live bacteria that when stored in freezing temperatures will perish

Manufacturer information

Dr. Tim`s Aquatics is the merging of the twin passions of the founder: fishkeeping and science. They make setting up and maintaining an aquarium easy by sharing practical advice and proven products developed through years of experience and their own real science.

Their products are developed with a simple goal – to make fishkeeping easy. You don`t need to be a biologist or chemist - they`ve got that covered! You don`t have to make mistakes – they`ve made hundreds so you can learn from them. Just have a little patience. There`s no magic or secrets – they`ve done the research and produced the products.

Dr. Tim has published numerous peer-reviewed scientific papers on nitrifying bacteria and filtration for aquariums and aquatic life-support systems. He also has written dozens of articles and columns for aquarium trade and hobby magazines. He has been an invited speaker to many national and international conferences and regularly speaks to aquarium societies.

Dr. Tim hold numerous patents for nitrifying bacteria, their use to accelerate nitrification in aquatic systems and their detection using molecular methods.

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