Discoloration, Burning on the Blades

ok heres the deal, 3 weeks ago i had a lil nute burn, i flushed and the problem subsided, everything is going great until 2 days ago, on a lower fan leaf, side of the blade i noticed some yellowing, today i found it spread to the other side of the same blade, the whole setup goes like this....plant is 6 weeks old, using fox farms happy frog, the nutes in the soil mix were too strong so i had to flush, i havent been giving any nutes from day one, i dont plan on using nutes for another week or so, the watering regiment is every 3-4 days since i wait for the soil to dry around 4-5inches from the top of soil,5gallon pot- temps at plant level are from 72(top of soil) to 78(midway up the tree), PH is a constant battle- my tap water is always 8ph , i oxyginate the water and add ph down and let it sit for a while, problem is the soil's PH is never less than 7.5...could this be nute defficientcy? i have no idea, from my first experience with the nute burn it doesnt seem to be that, the first flush took care of that immediatly...plant is under a 400w MH....the i looked at some pix from a link about nute deficiency and it could be that, perhaps someone could lend a helping hand, like i said its only on one blade, of one fan leaf which is the second set of leaves that grew, therefore its one of the oldest leaves on the plant

i thought maybe it could be from hot spots from the foil on the walls, so i rotated it and it spread over night, theres a lil burn on the tips of leaves next to this one, those are from the first nute burn a few weeks ago

anyone?i get better responses when im posting at 5am =)

cmon guys, maybe since i flushed the soil a few weeks back i lowered the N and i am suffering from Nitrogen def? at this stage, i have been informed a while back that VEG needs much N and flowering needs more P...all i want to know is if i am right, and how can i add more N? do i give her some food rich in N?

can someone please take a look at this and let me know if this is N deficiency please? i keep replying to my own threat to bump it up

I've got the same thing happening to my plant, but i don't think it's N def. I think it may be 1. heat 2. Mg def. or 3. C def. I've also read that it could be over or under watered.

rich, if you look at the plant problems section on the homoepage, you will see somone posted links about plant deficiencies, with pix and the one i seen was exactly like mine, in my case it makes sense bcus i flushed my soil 3 days after transplant, nute burn...its been 6 weeks and had no nutes other than what comes in the soil, im gonna find that link for you, it shows definitive pix with simple solutions...an absolute must read

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

my bad, i said phosphorus, its a potasium def, (k)

flushing soil with time released nutes can cause nutrient burn because what releases the timed nutes is water so when you flush you can possibly release tons of nutes and instead of fixing the problem you compound it and make it way worse..... which is why i hate time released nutes.
you think flushing should fix the problem but it doesnt it kills yer poor girl

Ur right, definately looks like the K needs a boost. those were good pics on that link, and easy readin for a lazy stoner like myself, heh heh. What u gonna use to boost the K?

im taking the advice from that link, it said use Fox farms grow big...and Phinxter, i guess the nutes in the soil are just about used up since its 6weeks old and watered about 8 times so far, thus making the soil impotent i guess, i will see what happens, if it keeps spreading then i have to go back to the drawing board

I think ur on the right track, she'll pull through