ZeroEdge makes open top aquariums that have overflowing water. It is similar to the infinity pools concept. The water flows over all four sides of the aquarium into an overflow channel that runs around the entire perimeter of the tank. Drains allow the water to circulate between the sump and the tank itself. It makes for a beautiful aquarium but it isn't recommended for all types of fish because some fish can jump out of the tank. Pricing for the tanks start at around $999. You can see a video of the aquariums here.
