To me that does not look like anything... But that just me.. I have tried to dip clams and never had luck. I think if it was closed up it was from the prymaid snails there a clam killer. I ended up changing the substrate to control them in my tank I would just keep an eye on the clam pick it up if you can every few weeks take it out and give it a scrub down with a tooth brush until there gone some wrasses will eat them also.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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