Thanks for the info all. I think I need to read the user manuals for all of the various Tunze controllers and decide if I want the resonant wave or not. Really all I'm looking for is for the softies and gorgonia to sway back and forth (and have the aquarium stay in one piece).

Oh, and I just realized I started this in the wrong sub-forum... Jim could you please move this to the "Flow and Filtration" area?

Thanks,
Tom