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The streaking near the veins and yellowish fluff along the underside of leaf is due to algae or "slime" growing in your water and choking the roots. The leaves eventually grey and turn under and the plants die. You need to use hydrogen peroxide or chlorine bleach to kill the stuff. 5 to 10ml of...

In an ebb and flow system the roots are highly oxygenated as they're basically hanging in the air most of the day during the ebb, thus the name aeroponics In other systems where the roots remain submerged continuously, getting oxygen to the roots and preventing anaerobic conditions is a...