My best guess from the pics provided is some kind of dove snail (taxonomic family Columbellidae) - if so, they’re most likely harmless.
Any chance of pics with some brighter light? Being able to see the shell and patterning more clearly may help with an ID.
(Fun fact because whelks were brought up: dove snails are Nassarius snails are from the same taxonomic superfamily as whelks - Buccinoidea - but whelks are from the family Buccinidae while dove snails - as mentioned - are from Columbellidae and Nassarius are from Nassariidae).
Any chance of pics with some brighter light? Being able to see the shell and patterning more clearly may help with an ID.
(Fun fact because whelks were brought up: dove snails are Nassarius snails are from the same taxonomic superfamily as whelks - Buccinoidea - but whelks are from the family Buccinidae while dove snails - as mentioned - are from Columbellidae and Nassarius are from Nassariidae).


