Abstract: An aquatic housing system having a rack that supports at least two housing levels. Each level includes a tank frame from which the tanks are held in suspended relation in back to back rows. A tank lid covers at least two fish tanks. A water manifold has separate valves for separate ones of the fish tanks so that water flow can be separately controlled for each fish tank. A drip tray is situated beneath each row to collect water spills from the fish tanks. The trays are part of a drainage assembly in which the drain holes of each tray are connected to a down spout arrangement that flows water downwardly via drain holes disposed in the tray of each level. Capability to hold different sized tanks and use tank dividers is also disclosed.