Sorry, I took a good look, that's not anything to do with KH.
I'd say reviewing it, CO2.
I've seen it do that in some tanks with poor CO2.
The pattern on the lower leaves, the dropping of leaves as well are signals.
Myriophyllum's/Egeria's will become brittle when DIC drops.
Look at it this way:
Nutrients can be targeted easily. EI etc.
Test for confirmation, calibrate the test.
Add a little GH(both Mg and Ca).
Add plenty of traces.
You have covered your bases there right?
What is left?
1. Stability/time to reacclimate(3 weeks for most plants, many will take even longer top recover)
2. and CO2.
We will assume the light is not an issue.
Also, assume that many plants are more sensitive to lower levels of CO2 or nutrients than others, but none are particularly sensitive to higher levels of excess nutrients unless extreme.
We do well with this plant in CA.
I also know the person that collect this plant, the habitat and who brought it into the trade and I have the pictures.
It seems to be easier to grow and has more red/purple in the leaves. I still like the narrow leaf more personally.
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