Please help me diagnose what’s wrong

[Raiders]

Hi, please help me see what’s wrong with my grow. I’m currently in week 5 of veg and noticed the leaves starting to look good/yellow and a bit of curling. I have 4 plants and only 1 looks really bad. The other 3 looks healthy with the exception of 1 having mild symptoms on 1-2 leaves.

Using drip hydro nutrient line
Coco medium tupur
Ppm going in around 1100
Ph 5.8-6.0

Run off
Ppm 1800 (is this is too high?)
Ph 6.0

Room temp
78 lights on
72-70 lights off

Humidity
60%

Lights
Gavita DE running at 660W
Lights at about 45” from canopy

I keep my coco saturated, maybe 80-90% and feed every 2 days

 

[steamroller]

First I have never grown in coco.
Looks like Ca def.
Your runoff should not be higher then input as I understand.
Since I have never grown in coco I am not sure staying damp is good.
I believe even in coco a small dry back is healthy.
Mostly just giving you bump back to top for what my info is worth.
Good luck man!

 

[RootsRuler]

Might be your PPM count is a tad high. Your others may be able to tolerate it but this one seems to have reached its limit. I'd back off on the PPM to around 800 and once she recovers then you can go in 100ppm increments until you get back to your desired PPM.

This may help...

 

[Greenjourneyman]

Your B mix has too much potassium in it. Use the A during veg and B during bloom.