Classic rectangular shapeMechanical, chemical, and biological all-in-one filter includedLighter, brighter, safer, and stronger than glassChoose from a variety of acrylic colorsAvailable in a variety of size optionsIncludes high-capacity Bio-Fil filterSubmerged filters run silentlyFor fresh or salt water fishStand and Canopy sold seperatly . The classic rectangular aquarium shows off fish best because flat panes don't distort. Beginners choose the Uniquarium Rectangle Aquarium because it comes with everything they need: high-capacity Bio-Fil filter silent submersible high-capacity pump and more. Pros choose it because they know that's impressive gear maintaining perfect balance with no tubes pumps or hoses. Choose the size and tint to suit your individual taste. Sizes range from 20 to 300 gallons. Size: 50-Gal (36W x 15D x 20H in.). Color: Black.