Hexagonal shape: see from any angle3-way all-in-one Bio-Fil filter Lighter, brighter, safer, and stronger than glass Choose clear, blue, or black acrylic Available in a variety of sizes Submerged filters run silently For fresh or salt water fish. We think this is the best of all underwater worlds: The Uniquarium Flat Back Hexagonal Aquarium lets you see your dazzling fish from any angle, and has a flat back so it sits flush against a wall. Beginners love the everything-you-need simplicity, while pros respect the high-quality gear, including high-capacity Bio-Fil 3-way filter, Rio high-flow powerhead and more, maintaining perfect environmental balance with no ugly tubes, pumps, or hoses. Choose your favorite size and tint, and you're ready for fish. Size: 26-Gal (36W x 12D x 16H in.). Color: Black.