Powerman-
Just one further point about waves in aquariums: CAUTION
I know it is cool to see them, even mezmerizing....but they do multiply the stresses on the glass, and joints.
Some manufacturers are talking about altering their warranties to exclude the use of wave generating devices. I think the biggest concern is when guys set up Tunze waveboxes or Vortechs for a "maximum standing wave" in a continous fashion.
And tho I will be using both ( at least to experiment with for a while) I am not going to set up standing waves. Mostly - because my normal water level is 1" below the euro-bracing - so for me it would create a flood - and the constant change in water level would negate the "silent" part of the the overflow design I am using.
But - you can create the underwater effects of tidal wave action - without the waves on the surface of the water.
T