I have had gobies in the past but now have a sand sifting starfish...and he's awesome. Incredible to watch and keeps things cleaner than ever before. He's never done anything to my other livestock either.
If you like to keep the sand from covering your tank, you might try a couple of 2-spot gobies. They are sandsifters, but they keep right at the sandbed and don't rise as they sift, therefore all the sand stays on the bottom. I will warn you that they are extremely docile and any bullies in your tank will kill them quickly. They are also tiny and therefore it would take a few to do the job.
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