Common white hermits reef safe?

[weaglereefer]

Me and BigC07 are down at the beach and if you go out about 50ft the sandy bottom is covered in white hermits. They all have the same shells that appear to be from cerith snails. We were wondering if we could snag some up for the tanks, or at least for the sump. Don't plan on taking many, just 4-5 each for some diversity (already have red/blue legs, so white would mix it up).

Also, what about cowries, I've found a few of those as well, but don't have any in my tank. I know some people will bring up the ethics of taking something from the wild, but I'm not asking about that, I'm just asking if they'll go to town on my corals as soon as I put them in the tank.

Thanks!