Here's what it works. The tank is (virtually) segmented into nine parts on a 3x3 grid. Where the fish swim will determine button presses. For the purpose of this stream, a goldfish named "Aquarius" is Player 1 and a little swimmer named "Robert the Bruce" is Player 2.
Don't worry, the fish do not actually fight each other in real life. And the creator of the video assures us, "I am dedicated to taking the absolute best care of my fish that I can."
|Eddie Makuch is a news editor at GameSpot, and you can follow him on Twitter @EddieMakuch|