Should I be supplementing for my snails?

[SeeCrabRun]

Do I need to be adding anything to the tank for the health of my snails? Specifically calcium as they need it for their shells.

I currently only have live rock, no coral.

 

[Calappidae]

It's not a requirement but it helps to keep calcium in check to help their growth.. or shell development.. or something like that anyhow.

 

[SeeCrabRun]

I don't have a calcium test yet and don't know anything about the chemistry of it yet.

Do you know of resources to inform myself of balancing it in a fish only tank?