7 Days into flower, somethings wrong.

The strain is pk, is this the beginning of nitrogen deficiency?

Im growing in promix hp, following the GH feed chart (http://generalhydroponics.com/site/gh/docs/feeding_sched/GH-FloraSeries-DTW-Charts.pdf) .
My ph is 6.3 - 6.5, havent tested the run off ph, think it could be ph problem?

Well it's definitely not N deficiency. Your fans are dark green, plenty of N. Iron def maybe.

Mhogs said:

http://www.supergrowplants.com/marijuana weed problems guide.html

Click to expand...

Thanks guys. by the looks of that, it seems like it is a Iron deficiency. I will check my runoff ph, and see if my ph is above 6.5 somehow. If it is, should I just flush with 6.3 water to lower the soil ph, and then should i give it something to correct the deficiency or will it be available from my nutes now that the ph is lower.

I've never come across this type of issue so I'm only assuming it's not N def, I don't see how it could be with such dark green leaves which indicated plenty of N.

Yes fe- Iron can get blocked out with a ph of over 6.5 See what happens with ph runoff. First and foremost is getting ph near 6.5. Is promix considered soil or soilless? If soilless which I think it is you would need to get that ph down to 6 or so.

calmagplus has good iron, if you are using RO water it's a must but I'm no expert in promix or GH grows.