LOOK yellowing need advice PICS

So she is 6 weeks old ( lots os preflowers and pistiles), 400 MH switchable, 18/6, miricale gro dirt, mircale gro nutes with distilled water, 78 avg, 45 humidity, in about a 2 gallon pot, about 2 feet tall,... Now she is 1 of 10 so I have to wait about 2 more weeks (for the others) to start the flowering cycle, she is by far the oldest and biggest, but she is turning yellow on me... It started from the first 2 real leaves and has been spreading, now about 6 of my big fan leaves are turning yellow and i'm thinking will just dry out and fall off ( some of the first leaves all ready fell off ), i don't think this is normal and it starting to affect my secondary branches also, seems like to whole plant is gonna turn yellow and die,.. I really dont want this to happen, i noticed what i think are light/heat burn ( in the second picture ) on the upper fan leaves so I moved her down about a foot a week ago, and 2 days ago i started using "spray n grow" for foliar feeding to give it more micro nutes ( iron and zinc) and feed her nuts in the water with the miracle gro stuff for nitirogen, from the research i have done it seems yellowing is due to lack of nitrogen, and she seems to responed well today she look awsome but the leaves are still turning yellow, also should/could i cut the diying fan leaves off or leave them be?... one more thing is that her grow has stopped alot, she is getting wider and fatter but not any taller any help with that also? Pics 8 & 9 are my set up how does it look?

ive never had good luck with MG soil or products. it could be just a lack of N. its hard to say though. every time ive used MG soil my plants just really never seemed that happy. but some people do get great results, so it could go either way. im happy with my pro-mix and ill never go back. next time you water use a tsp of urine to a gallon of water. that will work better than the N in the "Grow ferts" that MG makes. ive been doin it for years, it sounds nasty but it makes them plants nice and green and its organic peace.

I agree with ice... it looks like the beginning of a Nitrogen deficiency. Also, Miracle Grow is complete horseshit. Especially their nutes. If I were you, i'd flush it with distilled or RO water for a week then switch to a nutrient solution more appropriate for growing MJ. Personaly, I use FoxFarms Ocean Forest soil and FoxFarms nutrients. I've always had great results with the FoxFarms line and I think others here will agree it's much more suitable for growing weed than Miracle Grow. If you do switch to FoxFarms nutes, I suggest using a half concentration (or about 600-800ppm if you have a meter).

Some off your fan leaves do have advanced stage nitrogen deficiency. Now slightly tug on them and if they come off easy then thats all right. You could try as you did to foliar feed but be careful with that because it is easy to overdue. The other fellows had great suggestions because of their experiences with miracle grow nutrients. I myself use the whole fox farm line up and I have always been happy with their performance. Just use half the fox farm feeding schedule and if you choose to use their souluble products ( open sesame, beastie bloomz, and cha ching) always monitor your pH because it drops it significantly especially cha ching.