Marineland (Aquaria) AML11536 Glass Half Moon Shaped Aquarium with LED Lighting, 20-Gallon Marineland half moon shaped aquarium with LED lighting make a stunning combination LED light provides a natural shimmering effect in the water, is energy efficient and powered by a low voltage adapter Each aquarium has a clear plastic canopy with a feeding hole and cut outs for the filter Includes LED light with 42 white and 3 blue LEDs.Measures 6-inch length by 2-3/5-inch width filter cut out; this aquarium has 20-gallon capacity Filter cut out dimensions are: 5.906 x 2.638 (inches)