Urgent!

Hey guys my White Widows auto is really sick . now from doing my research I thought she was cal/mag def but still week later after 2 feeds of cal/mag/iron she still getting worse. Please any help will be appreciated
 

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Medium?
Temps?
Humidity?
Ph going in?
What nutes?
How often are you feeding/watering?
Picture under regular light of whole plant
 
Medium?
Temps?
Humidity?
Ph going in?
What nutes?
How often are you feeding/watering?
Picture under regular light of whole plant

Medium- Canna Terra Pro
Temps - Hi 29 Low 26
Humidity - 33-40%
PH - each water I change between 6.8 - 6.2
Nutes - biobizz grow , bloom , topmax and cal/mag/iron
Feeding - once a week and normal water every 2 - 3 day.
Lighting - 2x 300w LEDs.

Will attach more recent photo once I finish work but this is photo of whole plant 7 days ago.
 

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The stems are all purple, flush it and stop feeding it for a few days, looks like a nute lockout, generally speaking autos don't really need alot of food, whatever it says on the bottle, give it 1/3rd of that...
 
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The stems are all purple, flush it and stop feeding it for a few days, looks like a nute lockout, generally speaking autos don't really need alot of food, whatever it says on the bottle, give it 1/3rd of that...

Yes I'm already only giving 1/3 strength. Yeah all this problem have started now its started to flower ! I'll give that a try then
 
The browning tips of the leaves look like over feeding so it makes me think lockout with purple stems as well, when you flush use a little bit of Epsom salt with it.
 
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I've given the girl a good flush couple days ago, still really purple in stem and leafs . attached a few photos see if its aging alrights still
 

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