the biiggest concern is that you do not want algae to form all over the tray and rootzone...

you need to light tight the tray with panda plastic or something. Look in the insulation area of the building material hardware store...for something reflective and firm enough to at least "sit" rigidly...some people use thin sheets of styrofoam...hope this helps
latewood Reviewed by latewood on . Roots Question In a simple Ebb and Flow (example below) how do you deal with the roots coming out the bottom of the media container? Is it an issue? I've always read that in Hydro the roots wouldn't grow out of control because they don't have to. So a simple container would do. Rating: 5