Had a problem with these a while back and lost 2 of my clams before it was contained. Visual inspection helped but a Melanurus Wrasse was the final solution. He has been a model member of my tank allthough tiny snails may be a snack.
http://www.marinecenter.com/fish/wra...lanuruswrasse/
good luck
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,

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