powerhead 56 gallon column

[altezza01]

i'm looking at powerheads for my 56 gallon column (30x18x24) and im interested in 2

hydor koralia evolution 550's or can i get away with 1? will this be enough water flow ? i also have a turbo-sea 580-p external water pump that is returning water from sump through flex hose. can someone reply quick. i am ready to order it tonight. thanks [TABLE="width: 425"]
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[Saulsa]

I really think that you'd need the 2 550s. Would you even consider a single mp10? A quality pump that could upgrade with you.

 

[altezza01]

I did think about the mp10 until I saw the price. A lil out of my price range. nice unit though. So 2 550's it is. Thanks