Well, the vortechs came in and what a decent deal I got. They has never been opened. Not even the security tape over the box tab had been cracked. The guy had bought 5, and ended up using 3.
I set them up, aligned them as instructions outlined carefully and very litle noise. I anticipate them being dead silent in a few days. I cannot hear them over my hood fans at all, but when I listen closely I can hear just a little wind up at high power. Nothing remarkable or even to think about.
I can see when people do not take the time to align them right how the could be noisy, but just making sure I hit center of the magnetic pull worked very well. I also made sure the adjustment for tank glass was set properly. That would make a difference too I think.
And yes, they do move some water. I have the random reef program going and everything has swelled and come out even more than it was. Happy happy tank!
Now I am off to MVLK's for a little bit to see if we cannot work out his PH. His test go off the charts, so I am bringing my meter.