Often when growing cannabis in coco coir, it is helpful to supplement with extra Calcium and Magnesium as calcium deficiencies & magnesium deficiencies are relatively common in coco coir. There are many supplements that provide a boost of these nutrients, and pretty much all of them will work fine. A commonly seen one called "Cal-Mag" by Botanicare works well (and is pretty inexpensive), and so does "CaliMagic" from General Hydroponics. Coco coir is an excellent growing medium as long as you maintain the pH between 5.5 - 6.5 and make sure the plants have enough calcium and magnesium.
My first EVER grow was coco. I used cal/mag supplement with every feeding. results were beyond my comprehension...I'm currently experiencing a calcium deficiency in an ORGANIC grow. Similar but SPOTTED leaves instead of what you are experiencing.
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