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Ammonia oxidising bacteria
From The Aquarium Wiki
[edit] What is is?
Ammonia oxidising bacteria (AOB) is the species of bacteria (typically the autotrophic type) involved in converting ammonia into nitrite during the cycling of a tank.
These species are different for salt water and fresh water aquariums.
- Dr. Tim Hovanec claims that it is Nitrosococcus sp. and not Nitrosomonas sp. that converts ammonia into nitrite. See PDF Paper.

