Circulation pump (powerhead)

Submersible pump that creates current in the aquarium. In marine aquariums it is essential for corals.

Detailed explanation

The target flow rate in marine reef aquariums is 20-50 times the volume per hour. Top brands: EcoTech (Vortech), Tunze (Turbelle), Maxspect (Gyre).

Random or wave flow is preferable to constant flow. Two pumps on opposite sides alternating to create a natural flow.

In freshwater aquariums, pumps are useful for current fish (Hillstream Loach) and CO2 distribution.