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

[Olly]

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.

 

[Olly]

Lesson learned : Don't even TRY to grow something unless you can control the PH of the RES. Complete waste of time.