I allways stay away from crabs, I find in the end they are more of a pain then they are worth. (esp if you have any direct feed corals, sun corals lps ect, they seem to steel the food) And I found fighting conch's, and sand stars (dont add a sand star till your sand bed is totally mature) do a great job of keeping the sand mixed up. Sory and turbo snails, and the large strawberry ones are great.
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