I know nothing really about clams but read somewhere online that bristleworms can attack clams on the sandbed from the bottom/inside out???
Maybe one of the novice clam owners can shed some light?? So sorry to hear as it looked beautiful!
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Red Coral Online Store 
www.redcoralaquarium.net
45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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