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That one looks a bit different than the one I got with Liverock.com order but all the ones I got were predatory snails. They looked similar to nassarius but they harldy ever went in the sand.
After I added some nassarius, I witnessed one of these snails trying to kill one of my nassarius. I have since moved as many of them out of the tank as possible.
Like I said, that one looks a bit differnt but I would watch out. One of the AA members told me that if it likes the sand, it is probably a nassarius. If it spends most of it time on LR, then it is probably a predator snail.
Most of the nassarius I have are hidden most of the time. When you feed, they start popping up everywhere. Very cool
Not sure what they are, but they don't look like my nassarius. Might try contacting LR.com and see if it is a common species for them and what it might be.
Lor, your pic looks like a nassarius to me, but the pic GrndHog posted does not, the shell shape isn't right and his snail either has a spiked shell, or it wraps a mantle around the shell.
Here is a thread I started awhile back. These snails came from my liverock.com order. They were always on my LR and I started removing them after I witnessed an attack on a new nassarius snail I added.