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It's pretty blurry, but doesn't look like a fighting conch to me. Fighting conchs have eyes on stalks that poke out in two different directions and will stick their tongue way out of the shell to eat. Here's a pic of a conch:
Not sure but with the scale but I have very similar snails about 4-6mm long that hitch hiked a ride on some plants I bought. They seem to breed out of the water I started with 2 or 3 now have around 5 or 6 in about a month.
According to live aquaria nassarius snails only grow to about half an inch in size, I have one probably close to and inch if not bigger. I will pull one out and take a picture when I make it home