Help me ID a Probkem

[ePupDude]

I need some help figuring our what I need to do to help the girls. Edges of leaves are turning yellow and veins seem to be a dark green. Growing in a coco super mix, similar to Ed Rosenthals recipe. Watering just enough to make it to the bottom of the 1 gal pots and waiting for them to dry before watering again. New growth seems ok but then starts experiencing the same issues.

 

[ComfortablyNumb]

It looks a bit like a Mag issue, but it's different. It looks also like a couple of other things which makes me suspect the root zone. If symptoms are mixed or not clear, look to the roots for issues.

A couple of other questions to rule some things out.
Soil?
Lights? Distance from plant top? Dim setting?
What do you feed and when?
Take the temp of the roots, what is that?

 

[ePupDude]

Room temp 79.4

Root temp 74.7

Measured temp on leaves and it showed 92.3 which seems high

Running a Vivodun VS 2000 LED for veg. 28” above canopy at 80%

Growing in Coco super mix. Have not top dressed

Water is RO with CalMag added and PH’d to 6.2

​

 

[PauliBhoy]

Measured temp on leaves and it showed 92.3 which seems high

How did you measure leaf temp? Did you use an infrared thermometer?
What is the distance from your light to the canopy (or the leaf you measured)?

 

[ePupDude]

Yeah it was an infered set to surface temp mode. Held it about 10-12@ away from the lead. Lights are 28” above.

 

[ComfortablyNumb]

Ok, Not roots then. LOL

 

[PauliBhoy]

Yeah it was an infered set to surface temp mode. Held it about 10-12@ away from the lead. Lights are 28” above.

What kind of lights? What setting are they on?