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Any idea what this is ?

You need to trim away any affected leaf, and replant the healthier part, the spot can spread to adjacent leaf and cause melt the whole stem.

I've spot this before in my ludwigia nantan super only. It's probably some kind of disease.
Interesting yah, I saw couple of these as grey spots on the super red but turned green and now see it on a new TC arcuata. Hope more can comment on the specific disease. Cutting them off soon
 

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