Dr. Tim's One & Only Live Nitrifying Bacteria (Freshwater)The key to setting up a successful aquarium is to quickly convert the fish waste to a non toxic form. This is done by nitrifying bacteria. Under normal conditions it can take 30 to 45 days for these bacteria to become naturally established in a newly set up aquarium. Unfortunately, during this time period, ammonia and nitrite can increase to levels toxic to fish a common problem called New Tank Syndrome. Dr. Tim's One & Only Nitrifying Bacteria are