Unique two-sided design. 35- or 55-gallon capacity. Lighter, brighter, safer, and stronger than glass. Insulates better than glass. Choose between blue or black backgrounds. Choose from a variety of sizes. Your fish are just as curious as you are. (That's why they keep staring back at you.) The Uniquarium 75 Gallon Tube Aquarium features a unique two-room design connected by swim-through tubes, letting your fish explore and enjoy a change of scenery. Made of bright, strong acrylic, far superior to glass. Choose between two background colors in 35- and 55-gallon sizes. It's a fishy playground! Size: 35-Gal (36W x 10D x 24H in.). Color: Black.