I’ve had this snail for a couple of months, and didn’t think anything of the white spot that was on it. Tonight I was looking at everything, and saw this white spot open like a small clam.
It’s an almost pearl white, and very hard. Anyone have an idea of what it is? Is it going to effect my coral? Any help would be great. (Still working in my photo skills.)

It’s an almost pearl white, and very hard. Anyone have an idea of what it is? Is it going to effect my coral? Any help would be great. (Still working in my photo skills.)

