Big blue cheese problem??help

Hi guys i'm 4 weeks in to flower of my second grow and i may of hit a snag or maybe im just being stupid and worrying about nothing only i have not had this happen in my last grow i no its a different strain and they all grow differantly but i got 6 weeks left and i have noticed that i may have a N diff as it seems to be the older bigger fans that seem to be showing sighs of the yellowing.

bit of info for you to help.
Blue Cheese from clone
20LT NFT tank
400hps 12/12
ph 6.5
neuts canna flower A and B
30ml of each per 10L
temp74/82 on 66/70 off

So any suggestions would help to sort this problem out before it gets to bad also the yellowing is happening up the plant not at the bottom i have tryed adding more veg nuet to try and stableize it but no change in a week I took some pics when lights were off i will post more when the lights are on but for now any help will do.i also put a photo of my new mother and next clone.

First off, that is one bad ass SCrog you have going. I'm impressed with your set-up, you will have a great harvest.

What nutes are you using?

Thanks a lot dude she is my best yet my grid is 3ft wide and 3.5 ft long and is 2 ft above the tank just to give you an idear of how big she is.I have been using canna aqua vega A and B for veg and then swiched to canna aqua flores A and B a week after i switched to 12/12 ( npk 4 4 11)im starting to think that as she is so big i might not be giving her what she needs she has been on full neuts since 7 days after she went in to the tank(she was on half strenth for that week)

I'm not really familiar with those nutes, what are the ratios of the flowering nutes? I use FoxFarm nutes and give my plants Grow Big (6-4-4) a couple of times in flowering. They need the extra N when flowering.

They are 4-4-11 and i use 30ml of A and B per 10 L so 60ml total my veg nutes are 6-3-8 at 20ml of A and B per 10l. Do you think i should maybe add some of the veg neuts next time i feed her on top of her flower nutes?as she has only got 2 weeks till i start adding the boost which is just PK 13/14 at 15ml per 10L.

I think your flowering nutes should be doing the job since they are 4-4-11. I don't think you need to add your veg nutes on top of the flowering unless the yellowing gets worse. From the 1 pic I saw, I think you are fine. If you decide to add the veg nutes, do so at a reduced amount than normal, like 25% dosage. IMO, once you add the boost, you will be getting all the recommended nutes you will need.

Are all the fan leaves turning yellow, or just the one?

some of them i different places on the plant but it only seems to be on the bigger ones the rest look good.

Just keep an eye on them. If in a week you have noticed that the plants have gotten worse, then give some of the veg nutes at a reduced strength. Good luck.

will do mate they were feed last night so i will wait however i have had a dig about and it might be the type of plant as a lot of the pics i have seen of it after 4 weeks shows it having yellowing leaves.??maybe some you has grown it before will post something i have put it in the indoor growers forum and i will be updating it in that 1 so if you want any more info on my grow check it out on there.

View attachment 1784479View attachment 1784478The other pics you can see the yellow ones is ths normal?