I expect the periphyton to stay but its composition to change significantly and that should impact algae.
My hope, as well. I only wish there was some way to test/verify this.
Although I generally have no algae issues, it's always fun to see if we can find ways toward more robust approaches to achieve a final set-and-forget-it tank. Please: no laughing!
Post your sites that shows how this is done in an aquarium with their tests.
I wanted to alert you to something that may change your opinion of the site you referenced. My intent is to just give you something to consider in case you want to investigate the de-nitrification issue further. Who knows, maybe you’ll become our resident expert on de-nitrification.
The study on the website states that nitrates were “deliberately kept very high, 120 to 240 ppm.” and the author claims that only he did the “scientific experiment with controls.” However, the author seems to have missed a major control point. Could the author have missed the possibility that he had killed all of the bacteria?
High nitrate (nitric acid) removes the buffers in water, causing pH to plunge. Like aerobic bacteria, anaerobic bacteria begin to die below pH of about 7.0. Essentially, NO3 higher than ~100ppm will severely stall the nitrogen cycle as though they had induced an over-the-top “old tank syndrome” environment. So, unless they constantly monitored and maintained pH at optimal levels, they may not have had any de-nitrifying bacteria, let alone not having enough aerobic bacteria (some forms of aerobic bacteria do step in to take-up the slack at low pH levels).
Of course, without the anaerobic bacteria, there is no hope of de-nitrification, but they would also be struggling with ammonia (TAN). However, at such low pH the TAN would be in a fish-safe ammonium form, so the hardy fish that were selected for the NO3 onslaught would have also survived high ammonium levels.
The study makes no mention of controlling or monitoring pH or TAN, which is a major oversight. It may have been a far different outcome had pH been maintained at the optimal minimum of 7.0 and TAN had been monitored. A much lower level of NO3 would also have made it much more realistic, perhaps 60-80ppm. As @Edward
mentioned, supplying CO2 as we do with pressurized systems may have further shown anaerobic bacterial activity by supplying carbon.
We do have something of an expert on the subject in @Phil Edwards
, who occasionally pops in. You may find these two threads of interest: