Desperately need Help - Yellow leaves, green veins - pics!!!

Details:

Paradise Seeds Wappa 3rd week flowering
150w hps + 200w cfl cfl only on for 6 hrs a day
ph - 6.5
Fox Farm Ocean Forest soil
Earth Juice complete line
temp - 65-80
rh - 60-70%

This started at the bottom and is taking over pretty quick. I know it's not N and I wouldn't think any kind of micro nutrient def either. I've used EJ Microblast about every 2-3 weeks. Somone told me it looked like iron so I added something with a little more than the Microblast..nothing! Someone else told me it looked like mg, but I wanna check here before I do anything else. Some of the pics are kinda blurry, but all the older leaves are turning yellow between the veins. Starts at the tip and works it's way down. All the newer growth is nice and green, but looks kinda waxy. Looks like the edges are starting to crinkle too. Any and all advice would be appreciated. If any other details are needed, lemme know.

It would be better to take pictures with normal lighting, the HPS messes with the coloring of the photo as you can see. Is there dolomite lime in your soil? Do you water the Microblast in or only apply foliarly?

^I was wondering about the PH too, I use FF's soil and got into the habit of adding lime at the beginning of flowering, because it has a tendency to go acidic, by week 3-4 of 12/12(after 5 weeks of veg). Before that, I kept thinking they were underfed, chasing deficiencies and overcorrecting, which didn't help anything, usually made it worse. Now, I just hit them with a heavy watering, with 2 tbsp of powdered lime per gallon of water(lime mixed in before pouring), so that cloudy water runs out the bottom of the pot, during the first week or two of 12/12, and don't have a problem anymore.

Could also be a simple mag deficiency, too, as I'm not familiar with those nutes. I use Calmag every watering(almost), which keeps that in check, even though my Dynagro is supposed to have enough. Works great for me.

I did add some lime, but it was only about 3 tbsp for a 7 gal bucket. I top dressed with about another tbsp lastnight. I've been mainly mixing the Microblast with nutes, but I have foliar fed once or twice. I checked the runoff yesterday and ph was 6.5. Here's some better pics.

Sounds like your PH is in check, so that's good. Looks like a magnesium deficiency, with those better pics, so either you gotta up the doseage, or, it's possible that it's already under control. Those leaves won't return to normal color, so it can be tough to tell, with the delayed effect and all.(takes days for most changes to occur) So, it's possible that the probelm could be fixed, yet the plants will look worse for the next day or three, while everything re-stabilizes, and the old damage is still revealing itself. I'm not helping much, am I?lol Well, if I were you, I'd hit it with some more magnesium, just to be safe, whether it be Calmag, epsoms, your microblast, etc....and monitor them. Also, it's still not too late to foliar feed, which'd help slow the progression. There's magnesium in the lime, but that stuff takes a long time to break down and become useable, and won't be much help in this case. You'd be wise to add some that's readily available, in fert form.

Cool...thanks a lot. That actually was very helpful. lol

looks like classic N def to me, more of your veg nute should help...