Abstract: A system for displaying a plurality of aquatic tanks, such as in an aquarium or pet store includes a first tank support frame portion for supporting a plurality of aquatic tanks at a first level; a second tank support frame portion for supporting a second plurality of aquatic tanks at a second level; and a step frame portion for supporting the first and second support frame portions with respect to an underlying surface so that the aquatic tanks supported by said first and second support frame portions are substantially at eye level. According to one aspect of the invention, the first tank support frame portion, the second tank support frame portion and the step frame portion are fabricated from a plurality of interconnected elongate structural members made of a lightweight, non-corrosive material that will not conduct electricity. The system is easy to deploy, durable against saltwater-induced and other corrosion and protected against transmitting electrical shocks.