Photoperiod Sick plants, need some assistance!

[Buzzybones]

What’s up AFN fam,

I’m attempting my first photoperiod grow this time around and I’m running into a problem with two of my girls. Not quite sure what’s causing it.
Some info:
4 strains in 1 gallon pots (peyote cookies, tangielope, strawberry glue, and LSD)
Temps around 75-80 F 50% humidity
100% canna coco
Roughly 2 weeks old (didn’t mark planting)
Currently 2 AutoCobs over the four ladies, will add another 3 once I harvest my current autos
Nutes: AN Sensei Grow A+B 2ml/L, AN calmag 2ml/L, Voodoo juice 1ml/L, B-52 1ml/L
Distilled Water. Nute mix around 5.8-6.0 ph

And some pics:
Tangielope leaves are pretty hard and curled under.t

Cookies leaves are curling upwards and tips down

The other two plants seem just fine
LSD

Strawberry glue

I would appreciate any help indentifying what I need to adjust/do. Cheers mates!

 

[DABaracuss]

Tips down means too much N you might need more cal/mag under led.plus different strains may feed different i.e. more food or less food.

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[Rev. Green Genes]

I would raise the light and/or dim them, and careful not to overwater. This looks mainly like those two issues.

 

[Waira]

.... how close are those COB's?
Have you done your homework on coco? It's a specialized medium, absolutely not like soil at all, and if you treat it like true soil, problems will come,... it closer to hydro in many aspects, but the coco itself has a lot of unusual features, including odd CEC (cation exchange capacity) properties; it's a Ca hog, preferentially binding it to the the particles and keeping it from the roots for uptake until it's sated, then it has proper give and take releasing,... Also, you need to monitor the EC/ppm's going in, and going out in run-off, usually 15-20%... this is meant to keep the nutrient salts from building up,.... this is just for starters! Coco can be fantastic, but you have to know the do's and don't's about it,...
...good that you're using Ca-Mg, stay on it,.....