I sometimes had troubles with different Rotala species (macranda red and green, rotundifolia, sp. green...) : after weeks of fine plant growth, new leaves turned out to be very small and white instead of green (or pink instead of red), and old leaves were melting...
It doesn't seem to happen anymore since I increased my dosing or K and Mg...
... but I can't tell if your problem is the same...
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