What is this on my live rock?

[Saltwatergirl40]

I just noticed theses guys a couple days ago there on 3 or 4 of my live rocks.i touched one today and it was hard. Sorry if the pictures suck did my best

 

[MaxTremors]

Vermetid snails. They can irritate corals, best to remove them (there are a few methods, just use the search function).

 

[Saltwatergirl40]

Vermetid snails. They can irritate corals, best to remove them (there are a few methods, just use the search function).

Thank you. I'm relatively new to saltwater aquariums