I am using roots coco (soilless or w/e)
Am watering with 5.5ish ph'ed water ...
Here's a leaf just a few days away from flip half way down the plant ... I'm starting to worry...
Run off is 6.0 at 600 ppm (.7 scale) after watering with a 400 ppm 5.4 watering
https://www.icmag.com/ic/picture.php?albumid=47201&pictureid=1102235View Image
IMO, your plant is hungry...how old is it? Or PH lockout...I had a similar problem...
next time, add dolomitic limestone to your media! In coco, it´s essencial IMO...