Yeah, with the gentler current, heavier stuff does tend to settle at the bottom. I use a gravel vacuum and long thick hose for doing big water changes, but I also do a quick clean with an air hose on a piece of clothes hanger that I rigged up. It doesn't suck out too much water, but lets me clean up all the poop and food chunks on the bottom quickly and easier to handle. I think you could even angle it a bit more upward to get more surface movement. I put mine up as much as possible, as long as it isn't shooting water out of the tank.