Sick - Toxic or Deficiency I cant decide.

[Noddy head]

Grown under 600 Sodium Lamp 12/12
In Soil - didnt use Perlite !
PH Soil 6
Watered every day
Flowing for past approx 7 weeks, unsure of variety. Good few buds, seems to have slow growth.
Fed Ionic bloom 3-5ml/1lr every 3/4 days.
Flushed out 2 days ago with 4 litres water.
I cant decide if the plant has a Nitrogen deficiency or is toxic, I suspect 2 others are toxic as showing claw symptoms in new leaves.
The bottom half of the plant is pale green with purple stems.
Any advice or direct would be greatly appreciated.

 

[al70]

it looks like a N def to me, I wouldn't worry about the purple stems, it's normal in some strains, goodluck.

 

[vapor]

how dry do you let your pots get?

 

[Dope time]

Looks in need of feed.Sure the PH is Correct!?

 

[Dope time]

Yea up the Dose! Get the leaf tips burnt
Looks like it'll pack on weight soon too

 

[BigSteve]

Needs more nutrients.

 

[bigshrimp]

I think vapor is on the right track here... possible overwatering

 

[headrushuk]

more nutes

 

[PoopyTeaBags]

feed it

 

[Noddy head]

Thanks, as a first time grower there is such a lot to learn, I have fed it the Ionic Bloom and PK boost today, I generally leave the pots till they feel light to lift. When should I feed it again ?
Please can you advise on Plant No 2, it could be a different variety, I only have two varieties and 4 plants but I do not know which are which, please see enclosed photos, they have been treated the same as the above plant, except, when I repotted from seedlings I could have used Seedling Soil in error instead of general compost. my main regret is not being more thorough and keeping a journal. I do not know what the ph of the soil is, will do it tonight with very basic kit. This is a smaller plant than above, much darker green with new leaves curly, slow growth, does seemed to have picked up since flushed through.
Fan on low directed at leaf tips, temp around 23-24, humidity low.

 

[Noddy head]

More photos

 

[buffinski]

It looks like the old bigger fan leaves yellowing so will be lack of nitrogen all the new growth looks OK. Your strain looks like a longer flowering one if its at seven weeks so I would suggest continuing feeding maybe give it a half strength veg feed to get a bit of nitrogen but dont go overboard though as late in flowering when flushing you want the big leaves to yellow but not just yet.

 

[Dope time]

^ There looking ok now noddyhead.
If you use LEDS and their to Close Bleaching happens

Now the light is Raised to nearly 4' (47") the Colour is Coming back as you can see with the Seedling n the Corner.Same Strain btw,either Psycosis x Ssh or Psycosis x killerkunk
Apart from this looks the same bleached/yellowed as your leaves in tha first Pics.