I've got two snail in my 30 gallon hex with my goldies and I'm kind of worried about calcium for them. Every time I go to the store I forget to look for some liquid calcium. On here I've read about using crushed coral...my question is does the coral have to be crushed or is it okay as whole peices. I ask becasue I've got a couple pieces of coral in my tank that I found on the beach in Florida. I scrubbed it really well and all that before I stuck it in, don't worry.

I'm just wondering if that can supply calcium for the snails or if I need to go get something else.