So Close to Harvest Fest...HELP ME PLEASE

These are some Millennium Girls just a Few weeks from Harvest, I'm using DWC and Soil, (in the same closet) but all the plants are suddenly exhibiting this Yellowing, brown spotting that's FREAKING me out! This is my first indoor grow, I don't wanna fail this close to being finished. I am using Botannicare Pro Bloom Hydro....PPM is about 1200....PH is 6 - 6.5...600 watt Eye Hortilux... This is like rounding third base and falling flat on my face! Any advice? Thank you brothers

possibly :

Potassium (K) Mobile Element and Macro Element

check out this thread and search for that problem here

http://www.icmag.com/ic/showthread.php?t=11688

I can't tell from your pic's but if they just started yellowing and you only a few weeks away from harvest your right on time. give the soil a flush and start backing the dwc nutes off.

yup flush em for day a or three with fresh water than try 900 ppm but in 2 weeks expect the leaf's to start yellowing