Marineland Eclipse Explorer Orca Fish Tank, Black, 2-Gallon First and only two-gallon aquarium with total three stage filtration Includes patented Marineland BIO-Wheel and high-performance Rite-Size Cartridges Seamless, injection-molded aquarium Silent operating filter Easy to set up and maintain 3-stage filtration system fits conveniently against the wall Seamless injection molding Silent operating filter Easy to set up, access, and operate Includes patented BIO-Wheel and Rite-Size filter cartridges