Hi Guys, Well I'm pushing the siamese cat off the keyboard where he tries to soak up the laptop heat and just "escaped" all the paragraphs I wrote to you, darn it! It just happens, DT, that I picked up a Hydor Koralia Nano a few weeks ago and I'm very happy with it. I uses inside/outside magnets to attach to the tank glass anywhere and I've got mine hidden behind a large swordplant leaf in the upper left rear corner, aiming down toward mid tank. I was worried about noise but its totally silent. It immediately kicked up loose debris and now I suspect most of that loose debris has made it to the filter input. The fish seem to love going in groups to have a "river current swim." Overall though I still think that circulation amount is a bit hard to decide about and this little powerhead, even the nano, is quite strong. You'll have an easier time of it with a bigger tank. Have no idea on longevity (they're Italian so who knows, lol.) The Koralia line had many recommendations on planted forums I think partly because the stream is less pinpoint, anyway I'm sure you're aware that there are a number of models in the line.
~~waterdrop~~