I have a 55g. I'm using 2 canister filters, 1 at each end. I'm finding dead spots in my tank where food and debris end up. What's a good circulation pattern to help? One filter's spraybar is on the top left horizontally moving surface water. Filter two's spraybar was on vertically towards the front glass. I moved it to the middle so it hits both the surface and middle of tank. The spraybar is too long to mount horizontally. Suggestions?