Hitchhiker Clam Id

riverreef

New member
I have been cycling my tank for 10 days. I got this live rock from an established tank but it had set outside in 40 degree weather for 4 days. I assumed everything but the bacteria would be dead. I thought this clam shell was just encrusted on the rock but today it came to life. It is about the size of a nickel. I tried to identify myself to no avail. Any help would be great, Thanks in advance.
 

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