The wave makers are basically power strips with timers switching different sockets on and off in 1-2 minute intervals (sometimes faster). The general rule of thumb is that your pumps should be pumping 10-30 times your current water volume so with a 55 gal
the heads should be pushing 550-1650 gph
depending on the live stock in the tank.
Best bet is to get 2 PH's and point them at each other and towards the surface to agitate the water. As the timer switches them on and off it simulates the push/pull of the ocean. In my setup I have two Hydor Koralia 3 PH's rated for 850gph each and my fish love swimming with the alternating currents, I also use the third timed socket to point a maxijet900 to flow behind my rockwork to eliminate dead zones.