Quote Originally Posted by Weedhound
Whenever you are in doubt about what is wrong I would immediately do three things.

1. Make sure your aeration is sufficient.
2. Make sure your ph meter is freshly calibrated
3. Drop your total ppms as overfert can present in some odd ways. Too much of one nute can actually lock out another.....although I''m not sure that's the problem here. The point from dropping the ppms is along the line of thinking the a deficiency will make your plant sicker.......but overnute can kill it off outright so always go with less in a situation you are unsure of.

That said..The yellow patches to me appear to be lightburn. What kind of light are you using and how far away is it? Can you get a pic of the entire plant, not just parts of it at a time? It would really help.

If you fill out Stinky's troubleshooting form it would be even easier (anda lot faster) to figure out your problem.
First of Thanks for your time and help Weedhound and wobster.

Stinkys Form

indoor
hydroponic
Rockwool with those red pellets surrounding
DWC
PH is 5.8-6.0
Water source is store bought drinking water comes 6.0 ph
Age is about 25 days
ppm sits at about 1200 when fresh batch is put in weekley
Lighting is Fluro 2 55w 6700 lumens bulbs about 8 inches away
temp varys from 72 to 78F
water temp sits at 72 all time
humidity not sure but 70-80%
lighting is on 24/0
several fans for vent
I presoaked the medium in 6.0 ph water for 2 days beforehand

Also about the pic Weedhound will get best pics I can alls I got is a cell phone but see what I can do.