Brain coral bit off more than it could chew

[BMW Rider]

When I was looking at my tank this morning after the lights came on, I noticed my brain coral looked a bit odd. I looked closer and realized that it had captured a snailor possibly a hermit crab and had it almost completely in its mouth. When I first spotted it, there was just a tiny bit of the shell visible in the mouth opening. It would appear it is now starting to release the shell as can be seen in the photo.