You really shouldnt be disturbing the sandbed if this is saltwater. Your powerheads should be enough flow to suspend anything that falls and lies on the sand. Mucking with the sandbed can release toxins and other nasties into the water which can be a bad thing.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.