To tell the truth I have never seen the point in power heads internal filters do a job and filter to
The eheim 2252 is a top internal prob the best on the market
800 gal tank with power heads wow
For a reef tank you need a lot of flow/currant in the tank. Different corals require high flow rates. The eheim pump is only like 300gph, just out of my return pump I get 5500gph, add on the powerheads another 13000gph.