Lighting time
I have three 1 watt moon lights over my 48 gallon and one over my 27 gallon that are on all night. My stony corals remain open as opposed to closing up without the night lighting. The inverts adapted and the fish still retire for the night. It's really not that much light when you think about it. Remember that in the tropics the nights are not usually cloudy all the time.
Larry
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