A concrete aquarium background gives your fish more areas to explore and hide while giving your tank a polished, professional appearance. This DIY project is an inexpensive way to hide unattractive pumps and filters and improve the look of your tank. Be sure to start this project at least a month before you need the tank so the concrete has time to cure and leech out any dangerous chemicals.
Hagen Marina Reversible Aquarium Background in Planted Oasis/Slate Wall - 24" W X 12" H, For aquariums up to 15 gallons. Beautiful Planted Oasis reverses to Slate Wall for 2 backgrounds in 1! Helps eliminate water stains from appearing. Hides tubing and power cords. - http://www.petco.com/shop/en/petcostore/hagen-marina-reversible-aquarium-background-in-planted-oasisslate-wall