The biOrb TUBE 15L Aquarium offers an unobstructed, 360 degree view of its underwater world. This exquisite 4 gallon aquarium is designed with cylindrical contouring and is available in sleek black or white trim. The biOrb TUBE is equipped with a standard white LED with an easy on and off switch. The biOrb TUBE 15 with LED light uses the same proven filtration system as the rest of the biOrb range. Like all biOrbs, the biOrb TUBE 15 uses ceramic media to provide biological filtration which has a surface area equivalent to the size of a soccer field. Any excess waste is collected and held in a filter cartridge at the base of the biOrb. To maintain your aquarium all you do is simply replace the filter cartridge every four weeks and change a third of the water. Also for your peace of mind, the light and air pump are low voltage.