While hopefully coming out of dealing with various tank challenges, I am taking the opportunity to change some of the basic setup. I think I need to increase or at least redirect the flow in all of my tanks, since I seem to have dead spots and junk that easily builds up on my sandbed - detritus, cyano, plating sand, everything. What are tips or resources people looking into this topic can check out for how to get some good, nonlinear current going? I have 3 tank shapes that I think require different circulation: regular box (4'x 2' x 21"), bookshelf/landscape (3' x 1' x 1'), cube (20"). I am having trouble figuring out how to get the flow bouncing off the walls AND moving vertically I wish I could drop in some colored dust and see where it goes, like the first time I poured Alk solution in front of a powerhead. Also, I recently got to see a member's tank (@Bruce Spiegelman ) that had a swell in part of the tank that I really loved. Totally looked like the ocean. What do people like/dislike about their flow?