How many hours of light do aquarium plants need daily?
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Expert Answer
In the first week of planting, give 3 to 4 hours of light daily; use fluorescent lamps in a tank. In the second growth week raise to 5 hours.
From the third week, when plants are adapted, keep 8 to 10 hours daily for photosynthesis. Keep lighting at fixed times to avoid disturbing growth rhythms.