New study shows that maybe it's only 1 bacteria responsible for ammonia to nitrate process.

[Cory]

http://www.sciencedaily.com/releases/2015/11/151126134915.htm

 

[Grimblegrumble]

interesting read.

 

[MattArmstrong]

More nerdy stuff: this study found that AOA dominate AOB in freshwater aquariums, so it isn't a bacteria at all: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0023281