i got a nice fathers day surprise my wife got me a wave box
in a 72"X24"X18" i get about an 1 1/2"- 2" wave but thats a little much so i turn down the strenth of the pump to a 1" wave. but you can get a double wave in a 6 foot tank about 2-7/8" waves.
double wave crests in the middle and troughs(spelling) on ends barely noticible
single 1 1/2" wave you can see light on the ends as it rocks back and forth no change in height in the middle
it lowers the tank water level and raises sump level. the higher the wave the more water that goes to the sump. but the higher the wave the closer you get to the top of the trim i get to the silicone at my biggest wave.
it has a photo cell and shuts off at night if you wish, or you can cycle it with a mutlicontroller
it very easy to setup, you find the frequency at 100% pump power by turning the knob on wave controller, you know when you hit your optimum frequency its very obvious. then you can adjust the wave height by turning down the pump power on the pump driver the blue box the pump is plugged into.
Durso standpipes are a must. you will see detritus you never knew you had.
HTH