Read the instructions on the package, make sure to PH them to 5.8. I use very lite nutrients with kelp and humic acid (read above)
My target is about 125PPM I hit 190PPM.
See the 10nth cube, it is not planted. It is my moisture control cube. I heft this one to determine when it is time to fertigate the cubes, this way you do not disturb roots you cannot see. I only pick up the seeded cubes when I transplant them. I try to transplant as soon as the seedlings are not susceptible to damping off. When they get transplanted to the Hugos they won't need fertigating for 9 days or more. The Hugos hold nearly a gallon of water and that is why you cannot just start a seed right in the Hugo, they just drown.
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