Brown/black area on large fan leaves

My first grow, please check the photos and any help would be appreciated.
breed:White widow
7th week of veg.
(2) 400 watt mh lamps on 24/7
soil- Organicare Pure Earth
nutes: Alaska fish and Humbolt Nutriants 5-9-4 1/4 streangth 4th week and 6th week

This is the only plant exibiting this symtom out of 7 PPP and 5 white widow.
I transplanted from 2 gal to 5 gal two weeks ago, it had a little of the same symptoms then, but now it has spread.

I checked all the other sites, forums for hints as to what might be happening, but came up a blank. I figure maybe someone here has seen this befor. It shows only on the large bottom fan leaves.

Thanks for any help in advance

...post some pics

trichlone fiend said:

...post some pics

Click to expand...

first post, I thought I posted the picts but I'll try again
-sorry

looks like your plants aren't getting enough N..also check your ph.

Havent checked ph, test kit should be ariving in a few days via ups. Gave the babies a dose of nutes this morning, I'll see if that clears it up.
Do you have a recomendation for a good nute mix/program for soil grows? there are so many on the market all claiming to be the latest and greatest. It frankly leaves me a little overwelmed. I will be getting PureBlendPro-Soil- Bloom in a few days for the flowering nutes. Any experience with this? I am trying to keep it organic as much as possible.

dude you wanna know the best advice I can give you is...DON'T BELIEVE THE HYPE!!!....nute companies all say their shit's the best...never underestimate the power of plain water...SERIOUSLY!!!!

I think its a PH problem. Read up on PH problems.

think its the PH i was running a Aquaponic set and my plant are doing the same thing. so i checked the Ph and it was to high. i guess because of all the fish build up.
so i got a bucket of rain water that has a ph of 6.5 and also moved my 250 MH higher im hoping that corrects the problem.