Question about power heads how many what size

Are you going to use a sump with a decent return pump? If so the amount of power heads and there size become a factor determining how many gallons the return pump is, what type of caorals you are going to house and the flow you want.
 
For a 55g tank, I'd want around 600 gph total circulation. I use Maxi-Jet powerheads, although powerheads are rather ugly.
 
For softies I concur with around 600 gph -- about 10-15X tank volume turned over per hour. A couple of powerheads in the back corners should do it...
 
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