What medium are you in? I would get a really good scope and closely examine the those tops for broad mites as they can cause the look you are seeing. If it's not pest related then I would closely check the root zone EC and pH. Also, plants need dark time just like we do. 18 hours is plenty of light and running them 24 hours/day causes stress along with wasting emergy!
I agree with you on lighting, but this isn't quite looking like BMs to me, brother. It's looking like pH is off (the twisting of both large fan leaves and new growth).
Ty I checked for BM and it's not that. How do I check root zone ph and ec?
First, you have to have a way to measure pH and EC. EC stands for electrical conductivity and it's the basis for calculations also known as ppm (parts per million) and TDS (total dissolved solids). Using EC, measured in microSeimens, is more accurate since it's not a conversion to anything else. So a meter is what most growers use. However, for pH you can use litmus papers, I use them for measuring plant sap pH (when I think about it!). Otherwise a small electronic pen is what most like to use. Brand I cannot make a good recommendation for, because I only ever got a Hanna and then stopped using it for the most part.
I can tell you how I like to test pH and EC, however, and that's by the slurry method.
You take a measure of 0EC water, either RO (reverse osmosis) or distilled--measure its parameters (EC and pH).
Now, take some soil samples from the plant(s) in question. You want samples from the top, bottom and root zone, and yes, you'll probably have to upend the plant to do this.
Mix those samples together, then add enough to the water to make a slurry.
Let that set for 7-10 minutes, then remeasure. Those parameters are fairly close to what's going on in the root zone. My own thoughts are that it's not too bad, but you should probably let the pH range, and if it's been high you do want to drop it. Good pH parameters for cannabis in soil is 6.2-6.8. Soilless is lower.
