IME the best critters to keep a sandbed clean are Tigertail or pink belly sea cucumbers. They are the equivalent of an underwater earthworm. They eat the sand, digest off the detritus and bacteria, and expel nice clean white casings of sand which break apart at the slightest current. Cucumbers also go under the sand as well. I have found them over 4" under the surface of the sand.
Cheers,
Tim
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