Pineapple Express Auto, Barney's hydro

Soaked Grodan 6x6x6 cubes in ph 5.5 and Great White. Inserted starter into the block. Noticed a yellowing from the inside of the leaves outward. I found out that I was under feeding them. I was using the week one of veg chart, duh. I am adjusting the nutrients up to where they should be.. Just in 12 hours the color of the leaves are improving.