The 24 Hour Light Cycle Aquarium | This is the aquarium that replicates the brightness and progression of sunlight, providing fish with a more natural, healthier habitat. Unlike the abrupt, glaring lights found on most aquariums, this model's LED gradually brightens and dims in sync with a 24-hour timer, mimicking the effects of the rising and setting sun. At night, the LED produces a warm blue hue, replicating moonlight.