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Title: Day on or night on, but not both!
Review: This doesn't work well with fish tanks. If you look at the picture, there are white plugs (always on), yellow plugs (daytime) and blue plugs (night). The way this works is that you can setup up to 7 times for the daylight plugs to turn on and off. Whenever the daylight plugs are off, the blue plugs are on, and vice versa. So, all you can really do with this is have daytime lights and nightime lights - you cannot have lights that overlap each other.
