Aloha Barbara,
The crab you found in a rock was not in a snail shell, right? It lives in a hole in the rock and comes in to our tanks as a hitchhiker in Live Rock. That's why we call it a Rock Crab. I'll bet your Zoanthids will be just fine now.
Hermit Crabs in shells, in fact all crabs in general typically don't start eating coral unless they are really hungry. In a new tank like yours they can get hungry enough to start eating coral, so it's a good idea to keep only a few hermits.
It's fortunate you got that Rock Crab out. In existing large displays, where the rock is not easily removed, there are two ways to handle it; 1) jab into the hole with a thin stick to kill the Rock Crab or 2) place a baited glass jar next to the rock on a 60 degree angle. When the crab goes after the bait that night, it can't climb back out of the jar.
Aloha
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