biOrb CUBE 30L Black with Multi-Colour Remote 2020.biOrb Cube 30 is ideal for keeping small fish or shrimps and is compact enough to place on your desk or in a small space. Most aquariums use small box filters and or smooth gravel which easily clogs with dirt. Like all biorbs, the biOrb Cube uses special ceramic media to provide biological filtration, which has a surface area equivalent to the size of a football pitch. Any excess waste is collected and held in a filter cartridge at the base of the