Yes BTT, I'm trying to remember (do you remember?) whether Nutrafin Cycle was the one we think Dr. Hovanec consulted on prior to going off on his own? I know that he was involved with one of the bacteria-in-a-bottle products prior, but I just can't remember which one.
I agree with you, absolutely not worth a beginner acually buying one of these (as opposed to being handed one in a starter tank kit, which is how most get them) at this stage of the ongoing research of these products as a simple batch of mature media is 100 times more powerful and we all know that even that can be hit or miss for your cycle (meaning that often a bacteria-in-a-bottle product falls below the radar of any effect you could actually measure or see in terms of speeding anything up.)
So what do we expect to get by pouring in our "Nf Cycle?" Well, if we use it to kick off a Fish-In Cycle, then of course we never know because there's not really enough feedback during fish-in to break the cycle into phases (with fish-in we are tied to maintaining the poisons below 0.25ppm, meaning many water changes and the speed of concentration drop therefor is always being artificially diluted by.. US!) So all we might know is the overall number of days it took to fish-in cycle, but we already know that that varies wildly between 3 weeks and 3 months -without- any products being put in, so in the end we have no experiment, I'd argue.
What if we dose it at the start of a Fishless Cycle? Well, here we get a little more feedback, since we are not doing water changes during the first phase and a half usually, but again the same problem arrises that there's just no control for comparison. We see pretty large variations of overall time of cycle and we have no way of knowing if the Nf was a significant factor. One of the reasons Hovanecs papers were so extremely rare and interesting for us was that as far as I know it was the -only- time anybody has ever published details of running 7 identical tanks at the same time with laboratory control over what went in to them.. we hobbyists just never do that, so unfortunately, by definition, our observations never really rise above the noise level.
~~waterdrop~~