Came off a live rock at the lfs... anyone know what it is? I didn’t see anything like it on the pinned guide for this forum. (It’s the thing that looks like a nut.. I’m guessing slug?)
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It's a clam. Won't harm anything.
Looks like some type of boring clam.
Non-photosynthetic clams are 100% filter feeders. They may survive for a while in our tanks, but most do not get enough plankton to survive. I am sure there are some on this forum that can keep them alive with dosing of phytoplankton.

