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That's a coral-boring barnacle; it's a filter feeder, so it's technically harmless (but large barnacles and small corals sometimes see issues).
In this case, due to the location of the barnacle and the size of the coral, I wouldn't expect any problems for the coral, but it may grow a little oddly around it.
That's a coral-boring barnacle; it's a filter feeder, so it's technically harmless (but large barnacles and small corals sometimes see issues).
In this case, due to the location of the barnacle and the size of the coral, I wouldn't expect any problems for the coral, but it may grow a little oddly around it.
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