UPDATE:
Ok, this tank really amazes me... I doubled dosing in the past 2 weeks, and all plants got back into shape.
Here is what I have been dosing for the past 2 weeks, 3x a week with water change every 2 weeks:
Fe DTPA 10% 0.15 ppm
Fe gluc. 12.46% 0.05 ppm
Mn 0.0625 ppm
B 0.0255 ppm
Zn 0.0325 ppm
Mo 0.00145 ppm
Cu 0.00165 ppm
The big winners are Ludwigia Repens and pretty much all other plants.... the only "negative" signs are some more curled and a little damaged leaves in AR. Also, the tips of Ludwigia Red seem a little bit deformed... see below and let me know what you think about it. My next 2 weeks plan is to dose the same regime without the Gluconate. As read on other threads, it looks like some people had issues with Gluc. Maybe that's the offending part? We must try and see...
Here are some pics:
Full Tank:
Ludwigia Repens
LudwigiaRepens and Ludwigia Red, note the tips of the Ludwigia, they are a little bit twisted... that wasn't the case before I increased dosing and added Gluconate:
Rotala Nanjenshan is growing pretty well despite the high traces. It isn't growing that well in my 75gl:
Stauro is a little shaded in this tank, and yet it grows super fast and the leaves are perfectly green... not the same in the 75gl, leaves there are a little yellow:
Ammania Golden is growing great here. In the 75 never did well for longer than 1 week:
This plant never did well in the 75gl, hereit is growing like a weed (what plant is it? Can you help me to ID it?)
And here is AR, they grow well, but leaves got a little more weavy and a little damaged on the sides. They used to be perfect before this new dosing regime:
Some nice shots of the weeds:
It is interesting to note that I am dosing in the same exact way my big 75gl tank, but I don't get quite the same exact results:
https://barrreport.com/threads/fablau-75-gallon-tank.14097/
Same water, same Co2, same light at the substrate... but of course we have a smaller tank here, shallower, more O2 thanks to the 24/7 air filter, a different filtering system (wet/dry in the 75gl)
So... seeing that plants grow better in this tank than in the 75, here are my hypothesis to explain why:
1. This tank has in some way more light because it is shallower. PAR increase faster from the substrate to the top. That could help plants to grow better.
2. More O2 could help more plants at night during respiration (but I use air aeration at night in my 75gl as well though!), but it could also help to oxidize traces faster (which, if that's a factor, could mean that less traces are available to plant for a longer time compared to the 75gl)
So... is the problem in my 75gl the fact I am dosing too much traces now for some reason? Or do I need more? Or something is out of balance I am trying to find out, and if you have any more ideas, please, let me know!