I don't think you can consider them sandsifters as such. They do eat detritus (and anything else they can get their arms on), so I guess in that sense they might be useful in the right aquarium.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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