I've been running a 6060 in my 75 Gal for about 2 months now and I think I might get rid of it. I always have issues with it shifting sand around (not severely though). But what I think was my deciding factor was that I pulled it out for cleaning the other day and all my corals seem happier. They are opened up so much nicer. I know people say you can never have to much flow, but I think the flow I had was more like a river, than the ocean. Anyone else have one in a 75Gal or similar tank? I'm going to give it a few more days, and then possibly put it up for sale.