Whelk or Nassarius juv. ID

So I came across these little guys inside my smaller aquarium this morning and had suspicions. I have nassarius in the aquarium, but received some new colonies some on rocks a few days ago. Even though I dipped them and inspected for pests, you can never be too sure. here are some pictures I got of the little snails and hopefully someone can give me a positive ID or an article or book to identify snails. The green marks are in mm so as you can imagine these are tiny fellas. And we all know the saying about pests, if you you see one, there are probably 5-10 that you don't see.

Personally, i believe that these are in fact nassarius, but some reassurance would be great!

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