need a ID for this

[pocilipora]

I had these snails not to long ago. The Astreas became irritated by them and would try to shake them off by quickly giving themselves a twist. If left unchecked the do kill your snails, as mine did. Im not sure if they are the pyramid snails but they sure look like them. A way to get rid of them for sure is by manual removal every day(and they will be there every day) and employ a wrass of some sort. Six lines love them but I chose a Christmas wrass. Six line may be better as it stays small and can get into smaller spaces.
You probably have them on your rock work aswell, just have to look hard because the hide.