HELP!!! Troublshooting form inside.

H=Answer if you grow hydro or aero
C=Answer if you grow coco
S=Answer if you grow traditional soil
L=Answer if you grow soilless other than coco (Promix, Hyponex, SunshineMix)
R=Answer if you grow in RockWool
T=Answer if you grow in HydroTon
D=Answer if you run any type of automatic drip system, including into soil or soilless
E= EVERYONE needs to answer lol!


E-indoor or outdoor
E-soil, soilless, coco, aero, or hydroponic
E-specific medium
CSL-Soil type/brand
HCL-Hydro/aero/soilless system type
SCL-Anything you have added to the soil
SCLR-Soil or slab runoff pH
E-Water source
E-Source water pH
HRT-Source water EC (if hydro)
E-Age of plant
E-Type of fertilizer
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added)
E-Lighting source and distance from plant
E-Air temperature (both day and night if you are running a dark period)
HD-Reservoir temperature
E-Air % Relative humidity
E-Lighting schedule
E-Type of ventilation your room has
TR-Did you pre-soak your media in pH corrected solution?

Indoor. 3x2x5' tent
Aeroponics/DWC
Tap water ph 5
Modified PH 5.5-6
3.5 Weeks
Dutch Master A&B, ADD.27
(56.9ml Add.27) (9.6ml A) (9.6ml B) in 5 gallons of water
1000w Multispectrum LED 24'' away
85 Degrees night 66 (I know this is warm but I have a Co2 Bag and with plenty of Co2 the plants can withstand heats well into the 100's)
Res temp unknown. I keep a 2L of frozen salt water pressed up against the tank though to help with cooling water during the "Daytime" Hours.
Rel Humidity 33-66%
18 on 6 off starting at 6pm. (trying to keep their hottest part of the day during our coolest part and vise versa)
2 air stones running 24/7 in tank Water pump 15min on, 15 min off

Problem that I am having is that only one of my plants in a 6 plant hydro/dwc is all of a sudden drooping or dieing. It has a killer root system, none of the other plants seem to be effected. Plus it was my strongest and tallest plant about 12 hours ago.

I added extra hydroton to the net cups to make sure there was no light getting to the roots. I emptied, cleaned, filled, added nutes, and adjusted ph to correct balance. It was time for me to start my week 3 nutrients but I didnt want to over do it so I just added 75% of what it said. So not to overload the sick one but not starve the others.

Here is a picture of what has happened in the last 12 hrs.IMAG0403-1.jpg
 
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