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Thanks m8. I do wish it were that simple, but reducing feed (and cycling water, water, feed- for the coco) never helped and actually made bounce back take longer. Which is when started to consider excess Ca Some waffling for explanation: In DWC started to experience rapid pH drop a week or so...

Updating in case anyone experiences same. 90% sure this has been caused by excess calcium, but not 100% yet. polishpollack correct in Sulphur deficiency diagnosis. However this is followed by further micro/trace nutrient def. on new growth, most likely manganese due to locations of necrosis...

Oooh, interesting, thanks m8. 100%? I have always assumed veins yellow first with sulfur def. Will use add some epsom salt, Mg boost will be good too.

Hoping someone can assist with diagnosing the 'little leaf' issues I keep on running into. First two pics are where it is more advanced - DWC. Other two pics are different plants - coco, about to get a feed after letting medium dry out a bit. Have seen on a few different plants, in different...