some clams prefer a rock to sit on some prefer a sandbed, my crocea for instance is on rock. eventually if it likes where it is it will attach, i had a clam for over a year that never did attach. i move it to another tank and it attached in a few days.
looks like yours is a crocea as well but i'm not 100% sure of that...might want to research further at wwwdotclamsdirectdotcom
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Darryl
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