What's up, Che?!
I've been meaning to check out your second grow for awhile. Mr west is a good resource for you. I agree with him that it is a mag def. A nitrogen deficiency would cause the leaves to become lighter green and then yellow EVENLY, unlike yours where all the discoloration is between the leaf veins. You proved with your first grow that the monkey juice will work in soil, but for this you will need the salts. They're not hard to find and should be something you have on hand anyway.