im pretty sure my plant has a calcium deficiency I use cal mag regularly I even tried doubling the dose recently I flushed it see if that would help and really put the cal mag to it I tried trimming the affected leaves to try and monitor it better any tips to try and fix this
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Sorry I'm late to the party but it looks more like manganese deficiency in my opinion. Detailed information on manganese deficiency: https://www.mrgrowit.com/post/manganese-deficiency-in-cannabis-plants