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. Unlike typical aquariums with filters that latch onto the top edge of the tank, this superior model's filter is on the bottom of the tank (where debris collects), allowing more effective removal of impurities. The filter also removes chemical pollutants that can discolor the water and prevent optimal light penetration. Ceramic rocks, designed to encourage the proliferation of bacteria that thrive on fish waste, surround the filter. Water stabilizers inside the filter automatically begin to dissolve if the water's PH level exceeds 8, helping to maintain an optimal water chemistry. The filtration system produces water with 100% dissolved oxygen saturation, 30% more than typical filters, creating an environment in which fish and beneficial bacteria are more apt to thrive. Filter cartridge lasts 4 to 6 weeks. 12 gallon capacity. Plugs into AC. Specify Red, White, or Black. 22" H x 14 3/4" W x 10" D. (26 lbs.)