Help diagnosing deficiency/rectifying the problem

Hello. Here's the details of my grow:

-3 plants, different unknown strains all at day 63 total, day 26 flower. All exhibit the same symptoms!


-Organic soil mix (not enough perlite, unsure if that's an issue)

-400w HPS. Indoor, 3x3 tent

-Temps at 72-88 degrees.

-Nutes are Fox Farms, 3 tsp big bloom, 2 tsp tiger bloom (occasionally 2tsp grow big) per gallon every watering, using either distilled or decchlorinated tap water PH'd to 6.2-6.8.

-I have not flushed at all yet. Transplanted twice, currently in ~ 1 gallon pots.

All three plants have been showing the same signs since veg stage. At first I thought it was a Ph issue, but I dont believe that's the problem. The leaves have been turning yellow in splotches, until the whole leaf is yellow and soft. It starts at the bottom and continues up, affecting each set of fan leaves as it goes.

. It doesn't appear to be nute burn or the typical yellowing of late flowering, as I haven't even hit week 4 yet and it's fairly progressive. All Other growth is very green and healthy.


PICTURES:
http://i.imgur.com/jiYfWcc.jpg



I think that covers it. So what's the problem? Salt buildup? Mag deficiency? Ask if I didn't cover anything. Thank you!

Nitrogen deficiency... Yellowing of the leafs is due to nitrogen deficiency. You are wayyy off haha. How you jumped around thinking it is this and that goes to tell me you haven't even looked on line at all. http://www.youtube.com/watch?v=-_IM7XEcxgw next time safe your self the hassle and USE THE INTERNET!!

Also, check the water that comes out the bottom of the pot when you water to see if the PH is unbalanced but most likely it need's a ass load more nitrogen

If you got worm shit near by, crab a hand full of it, wrap it in panty hose or a sock, hang it in a bucket and aerate it for a day or so. The water will turn a brown color. Water with that and watch your plant thank you