Hi all,any ideas what might be the problem here. Running 8 girls in RDWC,seeds from in-house genetics(platinum gelato) Currently 7 weeks since they popped,I have been doing a little mainline on them,stress has not been an issue so I don’t think that as they were thriving 2 weeks ago Plants did get hungry and I have feathered up to 400ppm in the last 2 weeks but since others are loving it Root zone is clean,oxygen is pumping with no notable differences from any other pot in the system Currently running Athena nutes with a ph around 6.2/6.3 and a chilled water zone of 20 degrees Celsius Tent temp is sitting at 26 degrees and 65% humidity and PPFD around the 500 and DLI is good.. They did recently show slight signs of mag def when they got hungry but was quickly corrected. This is my first grow in a long time so I’m a bit lost,and with plans on flipping in the next week I’m a bit concerned about wth is going on with these 2…the bigger one is showing heavier symptoms atm. pics also show the 2 plants sitting right next to them in the exact same environment which were all healthy 2 weeks ago..
Good evening. What exactly are you looking at that is an issue? 
Really looks like a Iron or mag issue. Mag is low leaves and iron top lvs. Can be difficult if you’ve never heard this. Im 100 that its iron deficiency. This happens a lot in coco and hydro.. hope this helps
They’re hungry.
Bump the EC/PPMs up, they look hungry. EC of 1.8 or 900 PPMs with a PH of 5.8-6.2 should turn them around 
I agree with @OGIncognito and @Myfriendis410 , looks hungry. At that point in a hydro grow my PPM would definitely be at 800-900. I usually run 1100 once they get to be a little bigger and then push 1200-1300ppm during flower. Once I get to about 3 weeks before harvest, I back down to about 800-900 again. Last week before harvest, plain PH’d water. Then, choppity-chop-chop.
Iron deficiency will turn the top new leaves white close to the petiole, that’s not iron on these, they are just hungry. 
But @Growdoc, @Echogold2017 works on a farm and has 20 years of experience!!! ROFLMAO!
Well I’m 12 grows deep! LMMFAO 
Hey,thanks mate
Just hungry ya think.?
Just 2 out of the 8 are struggling,others seem very good..?
Different plants can have different appetites, some want a bit more than others, perfectly normal.
I have not been on much lately, my wife hates it. But dude, had to comment. That was some serious shade throwing. That dude was just helping. Bullying is not a good look on ILGM. That dude did not deserve that. Shaking my head in disbelief… d$ck move.
I really think you should go back and check some of the misinformation and comments @Echogold2017 made before jumping @Deadhead about this. We get one every once in a while, never last long. I now return you back to our normally peaceful community. Carry on pharmers!
And I use jumping for lack of a better term, nothing meant by it!
Fair enough, I will not jump in next time. Just fixing a monkey wrench with monkey wrenching never sat well with me. I will stick to growing. It’s harvest time anyway.
I run RDWC as well. Start at around 700ppm with ph 5.7-5.8 in veg.
Flower ppm starts around 1100
Ph 5.9-6.0.
This works great for me.
Right i stay out of it even if i know the problem I’m just like whatever lol it’s not my problem