Quote Originally Posted by tinytoon
Paint top tray that plants sit in, bottom tray which is the res or both? I will post a pic or 2 later of the other DIY cabinet I put together but as you can see the first cabinet was bought and good lord was it overpriced!!!! save a ton of cash if you read before you do hehe
You don't want light getting to the root zone, or to the nutrient solution. The roots need to be in the dark, and where there aren't roots you will still get algae and nasty scum which can be avoided by making the tray opaque.