Rectifying the common myth about the species of nitrifying bacteria in our aquariums:

Nitrospira-Like Bacteria Associated with Nitrite Oxidation in Freshwater Aquaria -- Hovanec et al. 64 (1): 258 -- Applied and Environmental Microbiology

and

Identification of Bacteria Responsible for Ammonia Oxidation in Freshwater Aquaria -- Burrell et al. 67 (12): 5791 -- Applied and Environmental Microbiology

Please note you can access the entire article by clicking on the "Free pdf" section.

Regards,
Tom Barr