Rolf C. Hagen (USA) Corp.'s Marina 360 is a circular cylinder aquarium with no corners, edges and seams, and is designed to be viewed from any direction. The 2.65-gal. aquarium is just 10 in. across, making it ideal for any countertop, desk or other small space in the home or office, the manufacturer states. The system also includes LED lighting, an air pump and a filter.