It is indeed a nassarius. Not many get that big. The most likely is Nassarius dorsatus, which is also known to be supplement it's scavenging with predation. So while a Nassarius, not one you want as a scavenger
I have some HUGE ones too. I have around 10 in all, When I moved my tank there was very little muck in the sand I still think those guys and my sand sifting starfish were to thank for it.
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