On my candy cane...

[newmonium]

I've had my candy cane for 2 months or so. Have this on its side and can't figure it out... Looks like a shellfish maybe? It's on the trunk and closes when I shine direct light. Has 2 black spots on his back... Check out the thread I started for more pics but help?
https://www.reef2reef.com/index.php?threads/364562/

 

[Highgrade]

Scallop or clam most likely.

 

[newmonium]

Scallop or clam most likely.

Neither harmful right?

 

[Highgrade]

Neither harmful right?

Shouldn't be.