It might look like a traditional goldfish bowl, but the biOrb is the very lastest in hi-tech aquaria. Its special 5-stage filtration system ensures crystal-clear water for months between cartridge charges, resulting in low-maintenance for the owner and a healthy environment for fish. The cartridge changes are simple, too - no emptying of the water required. The 8 gallon plexiglass globe is 10 times stronger and gives around 10 times more space than a traditional bowl, while the air pump and filter are hidden away in the base. There is even a low-voltage light in the lid for added atmosphere.