What are your reservoir temps?
Lights on its about 21 degrees
Maybe one of you guys has an idea whats going on @peachfuzz, @OGIncognito or @Retiredoldguy ?
You have been really helpfull on my fiest dwc grow 
hey @Clandestino we will help if we can… i am currently camping for the winter and so not on every day like normal…so hopefully we can figure it out…
There is no way to properly diagnose plant issues without knowing the particulars of your grow.
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)
-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture in white light of any issues you may have to allow the community to assist you.
Ok thank you here are the specs that i know …
…
The 3 younger plants are Blueberry Headband, the older one is Gary Payton s1
-Age of plant : 14 & 21 days
-Method: DWC
-Vessels: 65 liters res. Per 2 plants
-PH and TDS of Water : ph 5.8 & 530 ppm ( input) / after a few days it went up do ph6.3
-Method used to measure PH and TDS : cheap amazon meters
-Indoor : 2.4 x 1.2m
-Light system List brand and wattage/spectrum : 1x marshydro 450watt 1x marshydro 350watt 1x spiderfarmer 100watt
-Current Light Schedule : 18/6
-Temps; Day : 23-26 C Night Na
-Humidity; Day : 30-40% Night Na
-Ventilation system; Yes
-AC, Humidifier, De-humidifier, : No
-Co2;, No
If growing Hydro some additional questions:
-DWC
-Distance of liquid below net pot (DWC): when i change out the res i fill it up until the net pots are 1-2 cm submerged in the solution
-Temperature of reservoir : 21 C
-TDS of nutrient solution : 530 ppm
-Amount of air to solution : 600l/h for both containers
You need to lower your water level to 2 inches below your net pots and 3 inches would be even beter from here on out…
Your running the risk of drowning them or damping them off by killing the trunk…
Also , you never mentioned the water temperature…
The plants look cold …
Another thing , is your little fans blowing directly on your plant’s?
If so , get a little stronger fan and point it at the wall and get the air to circulate around the tent instead of directly at your plant’s… 
Everything else looked like it was in range as far as i could tell…
Sometimes they just have little hiccups… 
Thank you @peachfuzz, i after my last post i read somewhere that you should leave a few cm between the net pots and the water level so i kept it 5 cm below for the ost few weeks … and the plants stardet to look a bit better.
It has now been 4 days since i switched to 12/12 light input, and today i noticed a few black spots on some leafes.
Here are some pics.
Maybe you know what is causing this …
I also feel like the plants are a bit light in colour
Thank you for the help 
