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I have a pair of Sleeper Gold Head gobies (Valencienna strigata) in my tank. They do an admirable job of sifting the sand as they feed. The only aside is that they rarely deposit the sand where they take it from. They rise to the surface and the sand scatters everywhere. Weekly I have to recontour the sand to get ride of the hills. I also have to blow the sand off of my plate coral daily to keep it from getting buried.
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