The World Record of “smallest working aquarium” has been achieved by Stanislav Konenko and Anatoly Konenko from Omsk, Russia.

In September 22, 2011 Konenkos have displayed a fish tank measuring 30 mm (length), 14 mm (width) and 24 mm (height).

This mini aquarium can hold 10 ml of water which is equivalent of two teaspoons. It also contains plants & stones and is home of some tiny zebra fish.