What are these?! (Not in the sticky hitchiker thread)

I have had my tank for about 5 months. Had a crash caused by the meanies at the store. Switched stores, now my tank is thriving. Bought live rock and a couple corals a few days ago, now these showed up! I can see appx 12 of them.

Little white dudes with 8 "arms" and a bubble on top.
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:bigeek:

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