11-16-2010, 12:56 PM
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From my rather extensive research I can say that any light during the period of "darkness" is likely detrimental to plants and fish. Both are naturally accustomed to roughly equal periods of daylight and total darkness, approximately 10 hours each, with the other 4 hours being dawn and dusk. This is standard across the tropics where the majority of our fish and plants occur.
"Darkness" means complete lack of any light. Moonlight normally does not reach the water as the overhanging forest canopy prevents it, as it does direct sunlight. This is one reason few streams have plants. Fish and plants need a rest each 24 hours, just as we do. Total darkness is the best and normal way to provide it.
I once came across a study on the effects of minimal light at night on plants, and it was quite "illuminating."
The plants did react to light coming through the window or from within the room during the night.