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...
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...