Is this a nassarius snail?

SourAngelfish

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I bought two of these today and I'm not sure that they're actually nassarius snails. Will these guys cause harm or are they basically the same thing?
 
I need a better pic of the snout. If the snout has a dark tattoo-like pattern, then most likely a whelk, but if it's "clear" or has a more even color, then most likely a nassarius. Nassarius tend to bury themselves in sand, whelks are usually out on glass and the rocks. If you drop some food in the tank and the snails bolt around looking for the food, then it's probably a nassarius, they're really fast.
 
I got a couple of them, this one didn't acclimate well and he looks a little different. His snout doesn't look very tube-like and he will not burrow. I'll probably wait until tomorrow and see if he buries himself and try to get him to go after some silversides.
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the top of the snout is definently black. What should I do with him?
 
that last pic doesn't look like a nassarious to me. the trunk is a lot longer & more slim. Do You have a sump maybe? if it is a whelk of some type it could eat corals or other snails maybe.
 
The one in the picture died earlier today and did not survive the acclimation, I'll probably feed a silverside today and check all of the other snails just to make sure none of the others are also whelks
 
I found another snail earlier that looked similar to the first one but the body looked like a nassarius with the same tube and everything. Are they able to have black shells?
 
that last pic doesn't look like a nassarious to me. the trunk is a lot longer & more slim. Do You have a sump maybe? if it is a whelk of some type it could eat corals or other snails maybe.

Yip agree with that, nassarrius got an antenna like tube, not thick at all. Also, the ones I had dived away very quickly and would only appear when food it around.
 

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