GH recommends a 24-7 drip for waterloving plants, look up what they recommend for tomatoes or peppers. They have similar growth aspects of marijuana. However I am amazed at what the rootball submerged in water turns into at ther end of a 4 month crop (assuming you have an airstone pumping...
I've used the waterfarm 8 pack system for the past 3 years. I used to leave the airpump on for the light cycle, but found I would get algea problems, and root rot. The plants would look healthy but would not produce to their fullest. The best way I have found to use the system is to hand water...