Hexagonal design for any angle view Lighter, brighter, safer, and stronger than glass Better insulation than glass Choose between blue or black backgrounds Choose from a variety of sizes Perfect for fresh or salt water fish. We think this is a breathtaking way to have best of all underwater worlds: The Flat Back Hexagonal Aquarium lets you see your dazzling fish from any angle, and it has a flat back so it can sit flush against a wall. Watch the angled glass sparkle and shimmer in the wavy light, thanks to acrylic's brilliant clarity. Choose between two background tint options, and sizes from 20 to 125 gallons. Size: 125-Gal (60W x 18D x 24H in.). Color: Sapphire Blue.