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Looks like you have some root issues, overwatered? Look like root rot, if not already to far maybe you should try hydrogen peroxide to combat the issue
Looks like potassium deficiency:
https://dutch-passion.com/en/blog/a-visual-guide-to-cannabis-deficiencies-n987#potassium
Flush your soil / base, and then add fertiliser rich in potassium at 6.3 - 6.5 PH
Looks like potassium deficency:
https://dutch-passion.com/en/blog/a-visual-guide-to-cannabis-deficiencies-n987#potassium
Flush your soli / base and ten add fertiliser rich in potassium at 6.3 - 6,5 PH