Anyone know what’s going on here?

This plant is having some issues, not sure why. It’s an AK planted Dec 1 in a 10 gallon pot in coco. Have been feeding with Blumats running 5-12-26 with some added calcium and magnesium. She seemed a little underfed at 800 ppm so boosted it to 1000. Now these upper fans are starting to yellow some. The tent is on 18/6. Any thoughts? The other 3 plants seem okay.

You're using a flowering NPK ratio. Increase the Nitrogen if you're trying to veg. Double check that your timer is set correctly cus it looks likes its trying to flower. Also dont take pics with grow lights on.