You could always build a robot that allows him to explore the world from the safety of his tank: http://io9.com/watch-this-goldfish-steer-its-very-own-robotic-t

You could always build a robot that allows him to explore the world from the safety of his tank: http://io9.com/watch-this-goldfish-steer-its-very-own-robotic-tank-aro-1519903858 http://io9.com/watch-this-goldfish-steer-its-very-own-roboti...