Hi, need help. Growing 4 girl scout cookies.
4th week of vege.
Medium is canna coco professional
Nutrients are the full coco canna range
Supplemented with CalMag @ 0.5ml per ltr every 2nd water.
Recently tried uric acid folar spray.
Feeding is to the canna chart
PH is between 5.5 and 6.2
Lights 400w hps and a 400w Full spectrum LED
Ventilation is a 150mm fan
2x ambient fans
System is a autopot self watering system.
Room size approx 1.2m×1.3m
Scrog.
Details; they are looking super healthy and rapid growth. In the last 1.5 weeks I’ve noticed some yellowing and small amount of tip ‘burn’.
This is my first coco grow, wondering if its salt buildup or a deficiency, or some other enviromental variable. How can I accurately diagnose.
Just want them to be healthy.
Cheers
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Calcium def. More cal mag
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Recommended is 3-5ml per gallon. You’re only at about 2ml per gallon.
I use 3 mill cal-mag per gallon with every watering … 
Thanks for advice I’ll try it, and should I folar spray with calmag? Once, to get fast uptake