There has been an important transition to circular fish tanks in the aquaculture sector recently.
Designed with central drainage and convenient inlet pipes, round tanks use gravity and centrifugal forces to keep themselves clean. Moving in a circular flow, the water will carry the solids to the central drain, where it can separate and vacuum to separate and reuse or dispose of.
With a properly designed inlet system, the oxygen-rich water will provide the correct current to evenly distribute the fresh water throughout the entire tank.