I use spring water with a 0ec, have low dose calmag but also dosed PK a bit late possibly and lights off temps have been under 15°c
Using canna nutes, only just started PK feed 1.7ec pH was 6.0 prior feed and 6.3 on the last. I normally sit on 5.8-6.0. Have had a calcium deficiency on most but I am only feeding every 3days or so, a lot of change over those 3days
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I don’t rate canna nutes at all, I bought some used them for a few weeks and was getting deficiencies, went straight back to bio bizz fish mix for veg and I use bio biz bloom and bio bizz top max for flower 
But your low temps probably didn’t help I’d imagine
You’ll get it though brother
Looks like nitrogen def. to me.
I wouldn’t even use them nutrients id switch to jacks 321 and u get to feed it the same thing everytime u water. Also start feeding every 2 days or everyday