Overwatering, early nut deficiency and also imbalanced pH all share common symptoms. From the look of things it's probably a combination of 2 of the 3. Don't let your plants sit in runoff. Allow your pot to dry some between waterings. Promote good drainage. Check your runoff pH and EC/ppm to see if you got buildup in your rootzone. Doesn't really look over/under fed, mostly drowned and suffocated.