General
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I thought it was nute burn but turned out she got not enough potassium. PH was always in range so I added back the Potassium.
Migrated her to another tent with a 150W light
Nutes
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Watering 2L of Water every 3 days with CalMag & Phyto Solution PhytoGreen NPK.
Light
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DLI is around 40
Defoliation
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No defoliation
@Biotabs, thanks for the tip :) turned out I gave her not enough potassium and noticed it to late. Wasn't a nute burn issue, will give the next plant a bit more PK on my next run.