WOW!!! is all I can say. I had the generic filter in my tank and ordered the Marina online. I read a reviewer here state that they aren't that good for a 10G so I cancelled and ran to Petco to get the AC20. All I can say is when I turned off the generic filter and went back downstairs to set up the AC20 Brad Pitt was on the surface, happily swimming around. I installed the AC20, put it on the lowest setting, AND added my soda bottle baffle, and I now have zero movement on the surface of my water. Brad Pitt is now happily swimming on the surface and is no longer a bottom dweller. He now frequents the filtered side of his tank, and I believe that he is much happier without irritating water flow.
Thanks BettaFish posters!!!
Also, this filter is pretty inexpensive to maintain. I'm only changing filters sporadically, spread out over a three month period, and the replacements are under 3 bucks, WOW. Another score for the financial team!!!