Thinking calcium or magnesium maybe deficiency
Coco ph 6.5
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Looks that way, ph 6.5 is too high for coco, the plant wont have all the nutrients it needs available to it. you should be between 5.8 and 6 at this stage.
Hope you are adding calmag btw cos it’s usually essential in coco. Especially under led lighting.
I’m usually fine at 1ml per litre in coco but if i go even a little below that…
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@Albannach delivers an excellent response.
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Will drop my ph to 6 many Thanks
I Had changed to a different cal mag that might have helped also with it
Many Thanks
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purple kush Terpenes smelling like grape cough syrup & vicks rub and can feel it on your eyes Wild 
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@ReikoX thanks brother i do try, occasionally 
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