Hey so my Jebao just got here and it looked really strong, my royal gramma was struggling against the current and some of my sand was being picked up. I put it at the very top of the tank as well. What can I do?An ow-10 can be dialed down to work in that tank. Put it on the back wall in wave 1 mode and keep the power at 1 and go from their. This will move water but not the sand if pointed towards the surface. Wave mode goes on/off every second. You can adjust the time faster or slower too.