An aquarium suitable for displaying jellyfish includes a chamber having interior walls that divide the chamber into a series of compartments. The first compartment is the viewing area having openings in the side walls that permit water to flow out of the viewing area while retaining jellyfish and flow into viewing area in a manner that keeps jellyfish suspended. A spillover riser is located between the first and second compartment that defines a channel through which the first and second compartment communicate. The second compartment has an air inlet providing the motive force to circulate water throughout the aquarium and introduce air bubbles to operate a foam fractionating device the inside the aquarium. The third compartment provides an area for placement of filter media and other necessary devices to keep jellyfish alive. The channel below the viewing area provides communication between the second and third compartment.