The Reef Octopus VarioS 4 Controllable Circulation Pump is a safe
and efficient controllable pump with integrated memory, two different
pause/feed modes, and silent operation. This pump has five flow
settings. It can be can be connected to a 3rd party controller such as
Aquarium water pumps are a necessity as they provide a current for
your aquarium, and move the water through your filtration. There are
various sizes depending on your specific needs. If there is not enough
water flow, your aquarium will be more susceptible to algae growth.
There are multiple types of water pumps. Some internal, some external,
and some with the sole purpose of wave making.