Leaf discoloration, first DWC grow

[Mike1230]

Hello, long time reader, just starting my first DWC grow and need a bit of advice. I've always grown outside in soil until now, so this is a bit different but things were going really well until I noticed some discoloration on one of my plants. I'm running Tahoe OG, exodus cheese, and white widow under a 600 watt mh, technaflora nutes with added pro-tekt, hydroguard, and zho. My water temps are 60-70, air temps are 74-82 during lights on, about 65 lights off, 40-50% rh, and I'm just starting wk 2 of veg nutes. Started at 1/3 strength (300 ppm) and increased to 1/2 strength (550 ppm) a few days ago. I also use 3 gallons RO water for every gallon of Tap water (to increase mineral content) I noticed the discoloration yesterday which looked a bit purplish today. Any help would be greatly appreciated! Here are some pics:

First Is a pic of the problem followed by pics of my setup.

 

[Mike1230]

Damn why didn't the pics of the problem come up..,. Hold on I'll try this again

 

[Mike1230]

Here is the one with the problem

 

[Mike1230]

Not sure why I can't edit my posts or post more than one image but the second pic is of the discoloration, it's a bit hard to see but it's purplish blotches on the lower leaves

 

[hello/Banana]

hello,

i think they might be a bit hungry, pic 1 looks a bit nitrogen deprived (unless just photo ???), and pic 2 looks like it may be drawing nutrients from reserves causing the coloration (not very sure about that though!)

VERY much guessing, it looks a bit strange for that age instead of standard yellowing (??)

- you didn't spray them with anything did you ?

(would have guessed spray application damage if only seen photo)

sorry of not being much help

 

[Mike1230]

That actually just made me think about my cool mist humidifier, the plant with the blotchy lower leaves is right next to the cool mist humidifier, is it possible that the mist from the humidifier is doing this? I use tap water with a low ppm in it.

 

[hello/Banana]

i dunno (??) - if it's leaching nutrients from the leaf (?).

sounds feasible (?)

it kind of looks like coloration in flowering, but i haven't seen it in veg early on like that - i thought seedlings mostly wilt, then go yellow (mine do anyway...)

here is a pic from flowering :

(maroc)

but still very much guessing...