A water circulation and filtration device for jellyfish aquarium, designed to be suspended from a top opening of the aquarium and partially submerged in water. It includes a pump house basket and a lid on top. The pump house basket has polygonal shape in horizontal cross sections, and tapered or straight in vertical cross sections. The pump house basket is divided into an intake chamber at the bottom with multiple inlet slits on its sides, a pump house chamber above the intake chamber to accommodate a pump, and a sealed return chamber around the pump house chamber. The sidewall of the pump house basket has a step feature which includes a plurality of flute style outlets disposed along the outside surface of the pump house basket above the inlet slits. The pump draws from the intake chamber and discharges to the return chamber and water is discharged via the outlets.
