I kind of crashed into
@Hufsa 's journal, since she was talking about increasing Boron, and she gave me plenty of advice. But we all know that her journal doesn't need any extra pages for tanks that aren't even hers, so I'll try and pull the conversation back to this thread.
Basically, after some local sub celebrity suggested that I boost B in my tank, like he does to his, I did some research to get a glimpse at what this boron thing is about.
My google-fu didn't find anything more scientific regarding B for aquatic plants, so I went with standard pages with their random opinions on stuff. Basically, boron is important, but there is no consensus if and how to know if we need more or less, as it is known for its toxicity and wide range of conflicting symptoms for both insufficiency and excess.
One source associated it to the plant's abilities to absorb Fe and Ca (and everything else). This got my eyes shining, since I've had Ca deficiency symptoms since forever, especially on Althernantheras. And I've been doing the Iron dance of chelators for a while now, with no noticeable improvement. After Hufsa questioned this information, I tried to look deeper into it, but could only find this one guy saying this, no one else.
Aquatic plants fertilizer - Aquascaping - Aquatic plants - Aqua Rebel
There is a widespread information saying that boron levels in surface fresh water is usually found in the range between 0.1 and 0.5ppm. My commercial micro mix adds 0.01ppm at recommended dosage. That raised a red flag for me. Hufsa astutely warned me that our plants are special snowflakes that not necessarily care about what is common in nature (not her actual words). Even then, I have to start from somewhere, and this looked promising.
As a final noteworthy point from my research, I found a thesis paper where the researcher studied long term effects of B toxicity in emersed river plants, looking at pollution containing techniques. They did a bunch of 1 year long tests on a few selected river plants to see how B would affect germination, plant density, growth and that sort of things. What caught my attention was that the lowest B concentration tested was 12.6ppm in water. And not all plants displayed any issues at that level, only at the following higher concentrations.
All things considered, my sub celebrity acquaintance recommended 5 to 10ml of pharmacy available boric acid (which I found to be a 3% solution) per 100L. This would add, if my math is right, from 0.26 to .52ppm. Caution led me to start with 5ml for my tank, with 300L of water (as a simplification), giving me something just under 0.09ppm. With theoretical accumulation, this would reach almost 0.18ppm. I added the first dose this Thursday and yesterday I did my weekly water change and dosed 5ml again. Haven't noticed any change so far.
********
Moving past this boron thing, Hufsa raised important points and gave meaningful advice on my experiment strategy. Basically, she thinks I do too many experiments, too fast, too broad, and I won't be able to properly understand what my results are. And she is absolutely right. However, my reasoning is that I have been doing subtle tests for a very long time now. This tank is 3 years old (there was this rebuilding almost one year ago) and I had a smaller tank before that with most of the same persisting issues. From the start I tried about everything my research would indicate may be important. They were long, proper tests, waiting weeks to see results, but the results never came. Worse, even, I rarely notice any difference at all. This is one point where Hufsa and I differ. She can hear her plant's complaints loud and clear, while I think I'm mostly deaf to them. I change, change, change and don't see anything. This is why I moved onto more drastic changes, I want to see something happen! As an example, over a few steps I reduced K dosing from 18ppm to 3ppm and I can't say if the plants even noticed...
Hufsa said she sees chlorosis all around in my tank. Well, I have done a lot of iron experiments and nothing happens, plants stay the same. And I shouldn't have so many iron issues considering my water is so soft. At some point, I was dosing gluconate twice a day, adding up to 0.6ppm a week. The only test I can't perform is DTPA, I can't find it for sale.
There was this crypto which changed its color pattern recently, when I stopped dosing micros (except Fe). I have since resumed micros dosage, although not at the same levels as before, and the crypto still looks weird, although apparently it is still growing as large and fast as before. Other than that, my recurring issues are Althernanteras with corkscrew leaves, a few selected plants get massive GSA and BSA on their old leaves, and most plants take a very large plunge when adapting to my tank, and many didn't survive to see a better day.
This is also one thing that gets in the way of my tests, I seem to get much more meaningful results from plants due to them adapting themselves to my tank, then I get from trying to change things to fix something. A few plants that at first were basically dead are now seemingly unkillable and I don't think it is anything that I did.
***********
Now back to more journal related subjects, I have this B test going on and as of this weekend I started my long planned reduction on phosphates. They were brought up to 4ppm weekly a long time ago to try and fight GSA. There was noticeable improvement, especially on hardscape, but not so much on the plants which are affected. My new macro mix reduced the dose to 2.5ppm weekly. In order to keep the K levels the same, I increased KNO3. As a last minute change, I decided to reduce N dose slightly, since it was now sticking out after I reduced K and P... Reduced from something like 14.5 ppm of NO3 equivalent to 12 ppm of NO3 equivalent. Most of that comes from urea.
As for the SAE episode, apparently we are due for a happy end. I've had no more eaten plants, I added some sorry looking moss strands that I had surviving in a forgotten corner of the house and they are still there. As an unexpected corollary, the Riccia is growing once more, maybe a little too much. The Staurogyne are quickly recovering, their leaves are still small, but flawlessly intact. I took this picture during water change:

These are from the newcomer, L. inclinata green. I don't know what they are supposed to look like, but maybe it is one more on the chlorotic train... At least it is not dying, far from it.
Full tank pics, taken at night when the reflections are manageable but the finnex lights are already dimmed. I tried with and without the chinese indoor lamps, so it is either dark or distorted colors, up to you!
