First see if the problem is in older or younger leaves.

Old Growth light Green Nitrogen	Inner Leaves turn light green Magnesium	Outer leaves light green Potassium	Spotty olderleaves Molybdenum
Purple Veins Phosphorus	Deters ants Boron	Spotty olderleaves Zinc	Prevents Fungus Chlorine

Young growth uncurled Calcium	Inner Leaves turn light green Iron	Outer leaves light green Sulfur
leaves turn yellow Manganese	Yellow tips of leaves Copper	Prevents Fungus Nickel