Whelk or Nass. Snail?

Dantitan

Reefing newb
I saw the Derussa Clam post and didn't realize that there was a difference. If they are Whelks and not Nass', it would explain why they don't bury themselves in my sand-bed. I have four of them. I bought 1 Nass. Snail from a different LFS and it was about 3 times the size of the one in the pic and I only see it periodicly.


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Should I get rid of them or are they safe to keep? They don't seem to bother anything, but then again, I don't have any corals yet.
 
The Super Tongan Nass' is the one that I bought at a different LFS. I VERY rarely see it. The other 4 small ones look a lot like the Onyx.
 
Keep one eye open on the Onyx,if that is what you have.The pic you posted doesn't look like onyx to my eyes.The shell has a different pattern.
 
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