Such a unique idea... here is a dual purpose coffee table that incorporates an aquarium for all of your tropical fish that will certainly be a focal point of the room and conversation. The "Aquarium Coffee Table" has acrylic sides that provide clear viewing of the interior, while the removable tabletop of 1/4"-thick beveled tempered glass is large and sturdy enough for the typical daily coffee table action. The tank rests on a heavy-duty black acrylic base with lights in the base that illuminate the tank from beneath the bed of blue glass gravel. Comes with two-stage submersible filter pump and decorative plants. Aquarium Coffee Table 25-ga. With 36" sq. tabletop. Tank 15 1/2" H x 24" L x 24" W. $599.95 Aquarium End Table also available 15-ga 24" sq. tabletop. Tank 20" H x 15 1/2" sq $449.
I would personally use black rocks for an elegant pond affect.