I kept two sand stars in my 180 for about 6 months. Then I sold one as I was a little concerned about the starving. Now I have had one for a year and is doing great. I have also kept a marble fromia which I have seen feed on everything from HA to cyano. Though I am not sure about there diet completely.
A sand sifter goby may work well for you but the people who I know loved them then regretted it after.
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