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For a DSB, the "sifters" you want are pods, and worms and maybe some minibrittle stars. Other critters that may help are sea cucumbers, nassarius snails, cerrith snails and fighting conchs. Any of the sand sifting fish or gobies will be sifting for your pods and worms...to eat.
I read on another forum that there was at least one gobie that wouldn't eat the fauna, featured in an article in one of the hobbiest magazines....but the poster couldn't specify which gobie it was, and my experience with these fish has indicated otherwise.
Hope this is helpful as far as the gobies goes, it was for us we were thinking of going gobies but then fell in love with the scooter blennies and also got a a brittle star and the hermits seem to mix up the sand also.