whats this on my coral

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bigben2057

Aquarium Advice FINatic
Joined
Mar 4, 2012
Messages
600
Location
Henderson, NV
I bought some button coral today and its beginning to open back up and noticed this black looking thing that keep opening and closes when i walk by is it another breed of coral?
 

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They are a pure filter feeder, like a clam. I would imagine they would eat about anything a filter feeder would eat. They are a pest.
 
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