Need Help Identifying Something

Truckie

Reefing newb
Was wondering if someone could help me ID these things that have been popping up in my tank. I noticed this one on the live rock a few weeks ago and today I found a few more. Looks like some kind of egg casing to me but I have no idea what it's from.

55 Gal. with:
-2 Clownfish
-Royal Gramma
-Yellow Watchman Goby
-Pistol Shrimp
-2 Emerald Crabs
-Approx 6 hermit crabs
-Approx 6 snails (I noticed one or two died recently)

Tank has been running since April
 

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It's a empty (dead) bivalve or clam shell, I'm sure you a few live ones in there too. They are good to have in your tank.
 
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