It was probably already damaged unless your water parameters are really out of whack. Most healthy clams will close the second a predator gets close. And they close up hard. I accidentaly let a small cleaning brush fall in the tank right on top of my clam. That sucker would not let go. Held on for the better part of a day until it realized the brush was no threat.
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250 gal display tank plumbed directly to my wallet
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