Seedlings Stunted Hard, Please Help!!!

Ok so I am having, what I feel is major problems and I can figure out why.
Here is my original post topic where everything looked good - Also lots of info here about my setup and grow on original post. Not trying to make anyone do heavy reading just trying to get all info together.

• Strain: White Widow - Gowing in 5x5 7FT High tents.
• Type (fem/auto/reg): Auto Fem
• Climate (indoor/outdoor): Indoor
• Medium (soil/hydro/details): Coco Canna
• pH of runoff or solution in reservoir: PH is 6.5/7
• Nutrient mix strength (EC/TDS): No Nutrients yet
• Light type & schedule: Maxisun PB4000 Series. 30-34'' above tops of seedlings. Ive been doing 18/6 then 20/4 trying to see if I can force a growth spurt I left it on 24 hours last few days.
• Temperatures day & night: 72-78 degrees average
• Humidity day & night: 60% day and night
• Ventilation: Ac infiinity exhaust fans in each tent
• AC: Exterior air intake w/ AC infinity tank bringing in each tent 4'' at speed 5.
• Humidifier: Yes one in each tent to keep it at 60-65
• De-humidifier: Not needed yet so no
• Co2: I put a silly little CO2 plastic bottle in the tent with issues 3 days ago to try and help this issue.

dropbox link for pictures

Now here is the problem.....
I did 3 batches of Autoflowers. The first batch is the center 6 seedlings. The other 6 seedlings surrounding the first 6 were planted 1 week later and have almost caught up and are at the same stage as the originals. they COULD pass them but I am very nervous.
The oldest seedslings look yellowed, with dark edges of the leafs and are drooping down and not aimed upward.
At first I was doing the water bottle spray technique in a circle around the base of the seedling maybe 3 inches away keeping the top damp. Then I was told to water them so I watered them pretty damn well. Did I overwater them too early or am I not watering enough??? First timer here obviously.

Please help!
Love JF

You should post pictures instead of a link to the pictures. And use full size button when you do, please. Then people will be happy to help.
From what you have written, the ph seems a little high for hydro.

I don't run coco, but what I've picked up, here and elsewhere says you should feed every day with half strength nutes, never letting the coco dry out. There are no nutrients in coco, it's a soilless grow medium. And @JimmiP is right, 5.8 to 6.0 ph for coco is what I've read.

I would raise the light to 36” and go back to 18/6. When you water, pour it around the seedlings only and let it dry a little in between waterings not all the way. They look a little stressed probably by having the light on them for so long. Give them a 18/6 schedule and stick to it.

Get your Day temp up to 80-85. Somewhere in between that.
Running leds, you’ll need to maintain a hotter canopy temp.

You should notice a difference within a couple days.

So. I should start feeding nutrients?

Your coco looks dry. Your plants look awful small for a pot that size with medium that needs to stay moist

I concur with Jimbo. Start feeding low dose. Coco has zero nutrients. I grow in soil but germinate in rapid rooters and I precharge the rapid rooters with 1/4 strength nutrients.

GeneBanker said:

Your coco looks dry. Your plants look awful small for a pot that size with medium that needs to stay moist

Click to expand...

Yea I was told autoflowers hate being transplanted to i germinated them in papertowel then put right into the 3g pots. I didnt do any nutrients yet, which is making me think i need to ASAP. I thought the rule was to no nutes until the plant has developed on its own. I just did a low dose of nutrients on all of them. Crossing my fingers!!!