The original biOrb 30 fish tank is a great aquarium as it is so easy to use and maintain. The BiOrb 30 aquarium is named so because it holds 30 litres of water. Why not decorate your Reef One Biorb Aquarium with funky plants, colour balls and beautiful pebbles all designed to make your Biorb 30 tank look as cool as you want it! This iconic design offers a great environment for your fish with the Reef One multi-stage filtration that keeps the water clean and clear and the easy to change Biorb filter cartridges which makes maintenance a breeze.