Been there, done that. The powersweeps are wonderful in freshwater, but saltwater really messes with the sweeping motion. My coralline caked the sweepers fairly quickly. Why not try a regular powerhead, put in back of tank to aim towards the front glass, this has worked really well for me. My torch coral has doubled in size with a powerhead of 330g per hour on each end, aimed at the glass to deflect into the tank.