Please Help

I don't see it in the other picture. But is your hammer some type of ghost hammer? I have never seen a blue one (WHICH IS AWESOME!) I have see blue torch corals, there called ghost torches so I am curious of what the store you got this from said it was exactly.
 
Not really sure from your pic, but it may be a vermethid snail. Is the growth soft or hard. If it's hard then I would go with vermethid snail.
 
I'm with RA on vermethid snails. Do you spot feed your hammer? The snails are pigs and will steal food from coral.
 
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