can someone help i cant figure out whats going wrong

growing for 1st time and thought id start 60"x60"x80" secret jardin grow tent with one p600 LED grow light and starting with x4 dinafem moby dick xxl in 12 litre pots using canna terra professional mix and bio bizz grow/bloom nutes its week 6 and starting to see some deficiency's and toxicity's can anybody help me please to identify them please thanks i know the lasst picture of the last plant was because it was given to much N during veg all of the plants have got purple stems and and the first one has got yellowing starting from the top going to the bottom

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I don't think the last picture looks like too much Nitrogen.

In my opinion she looks like she could use some more nitrogen. How much are you feeding atm? PH/PPM? or Ml/Gallon?

Yellow/ Dead bottom foliage is normal for larger/older plants.

The purple stems are Cal/Mag deficiency.

I'm thinking you have a ph issue.

looks like it could use some Nitrogen,if the N level starts to fall off your plants will yellow,N,helps produce chlorophyll that makes the plant green and controls or dictates how green it is,,If you had too much you would be seeing some crow's claw ,the leave tips would be drooping or pointing downward or even curl under like talens of a bird,hence the term or the name ,Nitrogen is also essential for the plant to uptake all it's proper nutrients ,,increase N for a few days and see if it darkens back up,it should,,In a pinch & I have done this before urine works well,Most Nitrogen in many plant feeds is derived from urine,,You can pee in a 1 gallon milk jug then fill it the rest of the way with water one pee to a single gallon ,you won't hurt or burn the plant like that,& it will darken right up within a week np,,You can double check what I have told you you will find this has been used for hundreds if not thousands of years to amend or improve soil ,may sound funny but assure you it works just fine

^*tokes bud... maaaannn this is Dannnnkkkk, what'd you put in it?* ...OP-oh just this new nutrient I learned about online.

Don't feed it anything until your sure your pH is correct.
http://www.ilovegrowingmarijuana.com/marijuana-nutrient-deficiency-potassium