Grow Mediums Is this Nutrient Lockout or a Calcium deficiency? PIX

Hi guys. Incase anyone else has this.
I did a res change, left the EC at 1.1 (Was confident it wasnt nute burn) and added 4ml of cal mag per 10ltr. This seems to have lead to a recovery.
 
Lesson learned : Don't even TRY to grow something unless you can control the PH of the RES. Complete waste of time. :peace:
 
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