sea swirl or wave2k?

[crusty1]

The Tunze Wavebox constantly changes levels in the tank about 3/4-1" I think. That high flow constant surging could cause some damage.
The wave2ks move a lot of water yes, but there isn't a high pressure, and the water level doesn't change. When I first got them I was a little disappointed because I didn't feel a high pressure coming out of the box. When I started putting in the soft corals and saw the nice gentle waving action, I was impressed. It is nothing like the (2) 3/4" concentrated flow out of the discharge of my sump return pump at 1780 gph(even diffused). That blows the hell out of the corals.
If I had the time to set up a tank over a few months, I wouldn't hesitate for the ocean motions, and take the time to plumb it right. However by the time you add a decent pump, the price does add up.