Octagonal design offers maximum viewing. Lighter, brighter, safer, and stronger than glass. Insulates better than glass. Choose between blue or black backgrounds. Choose from a variety of sizes. The Clear For Life Octagon Aquarium is an amazing viewing stadium, where every seat is front-row. Smart design allows flush mount to the wall, with maximum viewing from any angle. Brilliant clear acrylic sparkles and catches light for a jewel effect. Acrylic aquariums are 50 percent lighter, 40 percent brighter, and 17 times stronger than glass. And they're just better looking. Size: 20-Gal (30W x 13D x 16H in.). Color: Black.