Novice grower here. I am now in my 6th week of flowering and I noticed a few weeks ago that the tips of my fan leaves were starting to curl up and were brittle to the touch. I suspected it was a cal mag defiency, because I am using a coco coir/perlite mix and forgot to mix in cal/mag, so for the past week I've fed it a plain water cal mag mix. I've ruled out light burn because about 60% of leaves have been effected not just ones near the light. I suspect it is nutrient burn.
info: week 6 of flowering
feeding schedule: general hydroponics 3-2-1 bloom, past week plain water with calmag
avg lights on temp/hum: between 85-90 degrees farenheit, 35%-40% avg humidity
strain: chronic hash
medium: coco coir perlite
![tmp_19742-20170120_064758-339227998.jpg](/data/attachments/2980/2980396-72d3e3bfe89eb88761a311dc8828e2df.jpg)
info: week 6 of flowering
feeding schedule: general hydroponics 3-2-1 bloom, past week plain water with calmag
avg lights on temp/hum: between 85-90 degrees farenheit, 35%-40% avg humidity
strain: chronic hash
medium: coco coir perlite
![tmp_19742-20170120_06491815851671.jpg](/data/attachments/2980/2980394-80baa452619d059b8b999421b272996d.jpg)
![tmp_19742-20170120_064846343974437.jpg](/data/attachments/2980/2980395-5f4057c00f3cd9ba5ab6146810b003fc.jpg)
![tmp_19742-20170120_064758-339227998.jpg](/data/attachments/2980/2980396-72d3e3bfe89eb88761a311dc8828e2df.jpg)