biOrb Classic 30L Aquarium MCR-LEDThe biOrb CLASSIC 30 MCR Aquarium combines good looks with high tech filtration. Most aquariums use small box filters and or smooth gravel which easily clogs with dirt. Like all biOrbs, the biOrb CLASSIC 30 uses special 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 biOrb CLASSIC 30