Babcock I am a new grower too. I am also using DWC setup and love it after failing with a drip system. My emmiters were glogging up from the salt in my well water system. I now distill my water daily and ph is most important. Since I distill my water my ph rarely flucuates much I am using GH General Hydroponics 3 part nutes. Follow the chart provided as to how much to use. The more air bubbles the better too use many air stones. The roots love the Oxygen and keeps the juice mixing too. I top off with distilled ph water as my level goes down. Keep the roots in the juice at all times that will determine the water level . Good luck. I am finally looking great except my cloning is bustin my balls. Not having any luck yet.