Newbie Question - Why/when To Use Power Heads?

LineDropper

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I'm in the process of setting up a 55g saltwater tank and would like to know why and when people use power heads? Are the used just to increase water flow through the entire tank or are they actually used to filter as well?

Thanks!
 
Powerheads are needed for corals and anything else living in an area that has water flow (damn near whole ocean is included in that). Corals in particular can die very quickly in inadequate water flow.
 
but also remember different corals prefer different flow.
 

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