Aquarium for jellyfish

A water tank for an aquarium suitable for keeping jellyfish and other plankton life, comprising:

• a water container having a generally cylindrical shape with two parallel front panels and a side surface;
• a sealed chamber having a water inlet;
• and
• a diffuser providing a water passage from the sealed chamber to the water container,
• wherein the diffuser is a stationary block disposed along a portion of the side surface of the water container, a surface of the block facing the side surface of the water container having a plurality of parallel channels formed thereon and each extending across the entire block, wherein the channels cooperate with the portion of the side surface of the water container to provide the water passage.

An aquarium system suitable for keeping jellyfish and other plankton life, comprising:

• a water tank including:
• an inlet;
• a discharge port;
• a water container having a generally cylindrical shape with two parallel front panels and a side surface;
• a sealed chamber connected to the inlet;
• and
• a diffuser providing a water passage from the sealed chamber to the water container, the diffuser having a plurality of parallel, elongated channels disposed along the side surface of the water container, the parallel, elongated channels being defined by the diffuser and the side surface and generating a plurality of parallel jet streams moving along the side surface of the water container;
• a water pump;
• a refrigeration unit;
• a water filter;
• and
• a foam fractionator,
• wherein the water pump, the refrigeration unit, the water filter and the foam fractionator are connected in series and connected to the discharge port and the inlet of the water tank by a drain and a return line, respectively.