Light will
accelerate the growth of algae and pathogens. Further, some brands of
chelated trace elements can also be ruined by UV light causing them to
become unavailable for root up-take. Therefore minimize exposure to light
as much as possible.
However in
achieving this, ensure the design allows adequate ventilation of air
otherwise this air will become humid and susceptible to disease. For
example, when placing a lid on the nutrient tank, have it in a raised
position so that air can freely enter and exit the tank (Fig 6.5).
