I was thinking about investing in an ebb & Flow system. But where do the weeds grow in this setup? Do they just fill the tank or somethin? http://growwurks.com/images/view.aspx?productId=32 How large is the reservoir in this pic? I can't find any website that will give me the size of the reservoir in gallons. I want something low maintenance. So is there a risk that the roots will clog up the drain pipe or the dispense hose as they get bigger? Is an airstone required with this set up? Also, what do ppl mean by flushing in an ebb & flow system? Does that mean setting the timmer to "ebb & flow" twice a day- meaning it gets watered every 12 hours or is it talking about a reservoir change every week to 2 weeks? Some of this lingo is a bit confusing. Also, I was looking into the aerograden setup. How come this is not a good choice for beginners? It just seems like it sprays a fine mist and there's no potential clogging to be concerned about. Any guidance is much appreciated. Thanks.