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you could try tahitian moon sand. Drs fosterand smith sells it and it is supposed to be inert and safe for SW aquariums. Plus it is pure black in color and would bring out the colors in a bright mantis shrimp. Just make sure it is not a mantis that changes colors on the fly like P. ciliata because it might turn it pure black.....actually that would be cool....You might want to ask if it is abrasive like silica sand, but otherwise it seems like a good idea to me...
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