Mag def?

[TheRocket]

Hey guys having an issue with 3 plants...

Symptoms:
Yellowing leaves
Purple stems
Loss of green in some leaves
Brown spots

The plants fan leaves are turning yellow, with some dying, i did mess up and feed flower food during first 2 weeks of 12/12!

Some info

Strain: Blue cheese
Flower: Turned them on 1/1/17
System: auto pots with coco
Food: ionics coco bloom, buddhas tree 9/18, sensizym
EC: 1.0 (using half dosage due to auto pots)
Ph: 5.8-6.0 (did go up to 6.1 for a week)
Temps: day 24oc, night 18oc
Lighting: 2 x 400watt
Tent size: 4x4ft

Pic:

Overall buds are looking decent, frosty as hell..
I did slightly over feed week 3 of 12/12 hence slight tip burn, it's the brown spots, purple stems and yellowing that's worrying me

 

[TheRocket]

In a bid for help

 

[Cannoisseuras]

Thats what it looks like to me.
I would give her some calmag plus I would give some epsom salts for the added magnesium.

I just went through the the exact same thing with my girl

anything that occurs in nature cannot be unnatural!

 

[TheRocket]

Hard to tell if it's slight nute burn or mag def.. I'm swaying more to mag because of the purple stalks on the leaves

 

[Cannoisseuras]

Hard to tell if it's slight nute burn or mag def.. I'm swaying more to mag because of the purple stalks on the leaves

Thats what got me too....those purple stalks thats exactly how mine looked

anything that occurs in nature cannot be unnatural!

 

[TheRocket]

I think it's lockout caused by high EC levels, just checked the run off and it was at 2.2, not ideal for blue cheese always found anything over 1.6 causes problems with blues

Well that's the auto pot system took out, just gonna do a run to waste and use drippers next grow