Chlorosis on upper new leaves

[Parthenolide]

The upper new leaves have chlorosis. The stem are green, and the base of the leaves are green. The leaves are yellow for about 50-100% of the leaf surface. The new leaves growing lower on the plant are normal.

Stared with 100% recommended strength General Hydro Veg nutrient, and switched to 150% two days ago. Using direct water culture and one 90 watt 660nm LED.

Obviously there is a deficiency problem. Do I simply increase the strength about once a week until all new growth is green?

 

[Monkeyfloss]

btw ... DWC = Deep Water Culture

 

[Monkeyfloss]

Using direct water culture and one 90 watt 660nm LED..............Obviously there is a deficiency problem. Do I simply increase the strength about once a week until all new growth is green?

Your light is the main deficiency problem. Firstly, I would drop your LED setup and move up to a CFL. ... I would also keep to the recommended dosage on the nutes.