Brown Spots On 2 Week Old Plants - Pics

Elkay

New Member
What Strain is it? 4 NL fems and 2 Super Silver Haze fems
How Many Plants? 6 total
Is it in Vegetative or Flowering Stage? Vegetative
If in Vegetative Stage... How Long? 2 weeks total
Indoor or Outdoor? Indoor
Soil or Hydro? Hydro
If Hydro, Reservoir size? 5 gal
If Hydro, Reservoir Temperature? 75 F
If Hydro, what type of Medium? Rapid rooters in hydroton
If Hydro, what type of Setup? DWC 2 airstones
Size (Wattage) of Light? How Many? Full spectrum 360w LED grow light 60x6w
Is it Air Cooled? Yes
Temperature of Room/Cabinet? Tent, 80 F
RH of Room/Cabinet? 47%
PH of Medium or Reservoir? 5.8 after adjusting from 6.1
Any Pests? Not that I'm aware of
Type and Strength of Fertilizers used? Just Rapid Start rooting enhancer for now. PPM 211 (some from tap water)
Size or Square Footage of Room? 2' x 3' x 5'h

I noticed white dust on NL 1 and NL 2 a few days ago. I did some research and concluded it was WPM so I sprayed it all 4 NL's down with water mixed with a bit of baking soda (SSHaze weren't in the tent yet). This seemed to take care of the WPM, I've read that the baking soda spray leaves behind some white specks on the leaves which can be seen in some pics below.

NL 1
This one was the fastest grower out of all 4 NL. Brown/yellowish spots can be seen on two leaves and one leaf looks twisty.
IMG_20160215_142711886.jpg


NL 2
Has not been looking great ever since the WPM. Half of the plant doesn't seem to be growing. Will most likely have to throw this one out but will wait on some advice first.
IMG_20160215_142705411.jpg
IMG_20160215_142655037.jpg


NL 3
Has been looking pretty healthy, I think. White specks leftover from baking soda mix seen below.
IMG_20160215_142639045.jpg


NL 4
Small brown/yellow spots on the leaf of this one.
IMG_20160215_142716752.jpg



Both Super Silver Haze seedlings look pretty healthy to me. I put them with the rest 2 days ago after they first sprouted.

SSH 1
IMG_20160215_142646213.jpg


SSH 2
IMG_20160215_142721111.jpg


I did a res flush yesterday and put in more Rapid Start. Can anyone give me any suggestions on how to move forward?
 
Before I flushed the res, I was using Distilled Water for it. Now its tap water that I let sit for a day or so. Could this be why?
 
I think this is nitrogen toxicity. I believe it was caused by too much rapid start so I replaced the res water with pure ph balanced tap, will add light nutrients after a few days.
 
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