Can anyone help identify the snail in these pictures? originally thought it was baby cerith since i do see eggs frequently, but read it is rare for them to reach maturity in home systems, and then came across threads on pyramid and rissoid. Hard for me to determine, but would like to remove sooner than later if pest. Only see them at lights off, but never hitchhiking on other snails.
I have no ornamental clams, but recently discovered a bivalve on one of my rocks. I assume it's been there for years without my notice since it's tucked away, can't get any decent pictures of it.
Appreciate any insight.

I have no ornamental clams, but recently discovered a bivalve on one of my rocks. I assume it's been there for years without my notice since it's tucked away, can't get any decent pictures of it.
Appreciate any insight.

