I never said it hurt, I just said it wasn't responsible for supplying your tank with the bacteria that ultimately handle the cycling chores.
The ammonia and nitrite oxidizers live in the same biofilm along with a host of heterotrophic bacteria. Both the ammonia and nitrite oxidizers live together not in separate locations. However, they do tend to colonize at different depths from the surface of the bio-film.
daize- there is research re ABIL. Many research projects start off by using it to get a big jump on establishing the bacterial colonies they need for the research.
Improved performance of an intensive rotifer culture system by using a nitrifying inoculum (ABIL)
From
http/www.vliz.be/imisdocs/publications/99136.pdf
An improved nitrifying enrichment to remove ammonium and nitrite from freshwater aquaria systems
from
http/www.sciencedirect.com/science/article/pii/S0044848601008833
Elevated salinity selects for a less diverse ammonia-oxidizing population in aquarium biofilters
from
http/onlinelibrary.wiley.com/doi/10.1016/j.femsec.2004.10.001/full
(this study identifies the bacteria)
Characterization of an Autotrophic Nitrogen-Removing Biofilm from a Highly Loaded Lab-Scale Rotating Biological Contactor
from
http/aem.asm.org/content/69/6/3626.full#ref-36
Start-up of autotrophic nitrogen removal reactors via sequential biocatalyst addition
from
https/biblio.ugent.be/publication/209175/file/869933.pdf
Development of nitrifying bacterial consortia for immobilizing in nitrifying bioreactors designed for penaeid and non-penaeid larval rearing systems in the tropics
from
http/nopr.niscair.res.in/bitstream/123456789/1522/1/IJMS%2035(3)%20240-248.pdf
Dimethyl sulfide removal from synthetic waste gas using a flat poly (dimethylsiloxane)-coated composite membrane bioreactor
from
http/www.aseanbiotechnology.info/Abstract/21015452.pdf
If you want to find more references do a Google Scholar search using "nitrifying bacteria inoculum + ABIL" and "nitrifying bacteria inoculum + Avecom"
There is a big difference between hobbyists reporting what they think happened and trained experience professionals (including pH.D.s) doing research under controlled conditions using the best lab caliber equipment and having access to information most of us do not even know exists. Ley me leave you with this story.
"I recently bough a new 20 gal. aquarium and set it up. I went with a fishless cycle and dosed some ammonia I was told was safe to use. So I added ammonia and tested and it said I had 2 ppm. A couple of days later I added the ammonia again and now my levels were over 3 ppm. A few days later I dosed the ammonia again and now my ammonia was almost at 5 ppm, so I stopped adding any more. But my ammonia levels would not come down. By about day ten I was so frustrated by the ammonia not dropping that in a fit I spit into the tank. That evening when I tested the ammonia level and it was down to 4 ppm. So I spit into my tank again. The next day the ammonia levels were close to 2 ppm. So once again I spit into my tank and the next day my ammonia was close to zero. I do not know what was in my spit but I believe it must contain ammonia eating bacteria or something that makes them develop faster as it made my ammonia go away. Anybody who is experiencing ammonia problems during cycling should be spitting into their tank to help as I believe it worked for me. "
(The above was not written with any individual in mind, I am merely trying to make the point that anecdotal reports do not qualify as research. Bear in mind that one of the hallmarks of valid research is that the same results should be obtained if the experiment is repeated by anyone using the same methods and controls.)