It's a tritoniid, but beyond that it's hard to tell from the pictures. They don't show much detail. It is a predator on cnidarians though, probably on some sort of soft coral in your system. I would check your softies, particularly leathers, for more of them or their egg spirals.
I only have one soft coral, a leather. It's a small frag so checking it won't be hard. I also have a small frag of xenia, could it have come from that?
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