08-03-2010, 10:23 PM
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Byron says it best in part four of his planted guide;
Originally Posted by Byron
In their natural habitats aquatic plants receive 10 hours of daylight and 10 hours of total darkness, with dusk and dawn being the remaining 4 hours. Using a timer is the best way to provide a duration of 10 to 12 hours of tank light each day. Ensure that the room allows for a minimum of 10 hours of complete darkness each day. Referring back to the issue of balance, the light duration must balance the nutrients available, including CO2. During the first few weeks after setting up a new planted aquarium, monitor plant growth carefully, and be prepared to increase or reduce the duration of light accordingly.