Since I'm a subscriber to Yote's theory of "If you can't go whitewater rafting on the top of your tank, you don't have enough flow" I'm never quite happy with how much flow I have.\n \nYesterday, I stopped by a LFS that is currently moving into a new location and ran across 6 Koralias\n \n1. Nano\n2 Koralia 3's\n1 Koralia 4\n2 Koralia 2's\n \nthey were all used and covered in coraline. I picked all of them up for . My nephew took 3 and I kept 3\n \nI like to place the majority of my powerheads on one wall, pushing the water toward my overflow box. That way I can keep some "lower flow" corals on one side of the tank, higher flow on the other, and don't need to constantly adjust my powerheads.\n \nThe top of my tank now looks like the mississippi river...\n \nSo I'm at (2) Koralia 4's, (2) Koralia 3's (1) Koralia 5, and some cheap powerhead I got at a fragswap that actually works well, but gives me fits suctioning onto the tank.