I need help identifying a nutrient deficiency in my hydroponic basil. The type I'm growing is Italian Large Leaf. Could someone take a look at the attached picture and give me some guidance? There is some intervenal chlorosis and one plant has developed small necrotic spots and a split in the leaves. The symptoms started with marginal chlorosis. The leaves are also beginning to cup. Thank you in advance if anyone is able to help me identify my problem.