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I posted another photo after it opened a bit more, I’m not too sureKinda hard to see, but if that's exposed skeleton, then it's not splitting. You have a problem.
sponge maybe?
I've never seen one grow on the head of a healthy hammer though.
I believe you are correct on it being a barnacle, there is a feather like rake that emerges and pulls back in to breathe it seems. Some people say I can super glue it but I hear they won’t really harm my corals if that’s true?Kinda hard to see in the pic but I have seen barnacles on the head of hammers. Would have a hole where their feather like rake emerges.

