Pest? ID help needed please

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nothing_fancy

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I found these tubes on the back/botom of one of my montiporas. They are hard and something inside it retracted when I picked it up. Doesn't look like a fan worm to me. The area where they have settled definitely bleached however its also an area that gets very little light where its placed. I notice the monti has not been looking as healthy as it usually does so thats how I discovered this. Attached is a photo of the potential pest and the opposite side of the coral which appears fairly healthy. If anyone can tell me what they are and if I should remove them that would be greatly appreciated. My instinct is to dip this piece but I dont want to jump to conclusions
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WheatToast

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It's hard to tell under the blue light, but it looks like you have vermetid snails:
I'm also seeing a few vermetid snails (sessile snails that live in tube-like shells) in the picture, which can irritate coral with their mucus and spread rapidly. Glue the openings shut to eliminate them.
 
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