You seem to appreciate a bargain. My opinion is that Hydor Koralia are junk. They claim 800 gph but I don't believe it. Penny for penny, the best powerhead for the money is the Maxijet Pro. Also, the Maxijet actually pushes the amount of water they claim. For that 55, I would get the Maxijet 900 Pro, less than $20 each at Amazon. Two of them would do 2000 gph in that 55.
I've studied and experimented with water flow extensively for over 20 years and find that it's not just the flow rate, it's also the placement and direction of flow that works. Placing two good stream powerheads, like the Maxijet Pro, down low on the sides or back corners with the streams pointing diagonally up to the center surface of the tank creates the best flow and turbulence for the best money.
My 2 cents.
Aloha,
Mark
P.S.
Wave action is overrated, though the set up described above does create wave action without any "wave controller" device. See the pic below. Furious flow and a little turbulence is what makes every marine animal happy.
Edited by Mark Peterson - July 01 2015 at 8:44pm
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