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.
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?