crocea problem

[spoiledcats]

I've had a crocea for about 4 or 5 years now that has been happy as a clam in it's location. All of a sudden, for the past week or so, it won't open up fully. I've never seen this before with this clam. Any suggestions?

 

[Bender]

Have you checked it for pyramid snails? Look around the mantle and around the base of the clam?