Large nassarius snails?

[offthehook]

Sold as nassarius but I’m curious as I don’t think I’ve ever seen them this big and color. Seems to have the little door on the back like other nassarius snails, the inside if shell seems smooth with no ridges, snout seems solid in color and the trap door doesn’t seem to cover entire opening but I’m questioning wether it is a whelk or a nassarius snail. I got a few of them and the behavior so far seems the same but something has me questioning it. Posted a couple pics and a video . Any feedback would be appreciated

 

[Mark Goode]

Looks like nassarius to me. Do they bury themselves until there is food in the water?

 

[offthehook]

Looks like nassarius to me. Do they bury themselves until there is food in the water?

Yes, however I see them out from time to time without feeding but mostly stay buried I did see them eating a snail but Im pretty sure the snail was already dead. The don’t seem to bother anything so I’m hopeful they are just very large nassarius snails. Just never seen them this size or color