I'm growing in soil and she's been growing great till recently maybe some of the runoff from my grow in the same tent using Coco coir runoff has got into the fabric pot , temps are 23 , humidity is at 55 and light is only at 60 percent
My best guess is it’s probably a ph issue. What ph iare your coco nutes? Just make sure it doesn’t continue to occur and the ship should right itself.
Edit: usually coco nutes are mixed at around 5.8, which is the low end of availability for potassium (in soil). Looks like it started to locked out potassium.