Well ok, lol. I did a bit of stuff with Fritzyme 9 and it appeared to be full of heterotrophs, not true nitrifyers. I concluded that by the time it got to the UK it was pretty useless, link attached;It doesn’t and your right.
If it gives the reefer “piece of mind” then by all means.
We just don’t do it in our set up’s any longer.
Fritzyme 9 modified cycle
It wasn't a criticism. - Just - trying to figure out what you're trying to prove? Nothin to prove, just a ramble, I find rambling sends me off in interesting tangents. I do find it interesting that the nitrifiers appear to still work though, once the carbon source is removed, not suffocated...
www.reef2reef.com