Hello folks,
This plant has lived in a jar with nothing added for at least 6+ months before I set up my current shrimp tank, and it was fine.
Then it grew for about 3 months since I set up this tank, and it was fine. I didn't dose much fertilizer, except maybe 1/5 to 1/10th the recommended dose of ThriveS, an all-in-one fertilizer. Thus nitrates always read at zero. I assume there is a tiny bit of nitrate from the decaying shrimp poop.
So anyway, I leave for a 1 week vacation, and after I came back, I noticed that this plant is yellowing while the other plants are fine (moss, s. repens, MC, DHG). I think the very tips / new growth is still green, but the older leaves are yellowing and falling off. Most guides suggest a nitrogen deficiency, but there are many people who run planted shrimp tanks with no fertilizer at all and their plants are still fine. Plus my other plants seems fine, so maybe this is due to something else?
The only things I can think of out of the ordinary is missing one week's worth of water change and very low fertilizer dosing.