What type of snails are these?

[FishOkay]

They only really come out at night. Lots of adult ones and a lot of smaller ones.

 

[Nate Chalk]

Sniper scorpinwing snails

 

[shakacuz]

dwarf cerith snails, i believe

 

[ISpeakForTheSeas]

Most snails are considered nocturnal (though they're technically not - they don't actually follow day/night patterns, night time is just safer/is when their food comes out). These guys honestly look like tiny conches to me (unlikely), so my guess is some kind of Nassarius snail.