Thanks for the advice. Im using the GROW nutrients that came with the stealth hydro system. They come in premeasured baggies and it says to only use a full sized one when the plants are about 6-8 inches, so I only used about half a bag. The nutrients contained are as follows:

NPK: 10:5:14
Calcium: 6%
Magnesium: 2%
Sulphur: 3%
Iron :0.12%
Maganese: 0.05%
Boron, Copper, Chloride, Molybdenum & Zinc: 0.01% or less