I think my nem ate my damsel

I woke up this morning and about an hour later realized I was missing one of my residents. My blue damsel is missing. He decided to make his cave beside the nem shortly after I got the nem last week. It's a condy nem. This morning I noticed my nem was closed up like it was eating. I think I know what he ate. Should I do anything? Water change? I haven't tested anything yet so I don't know if anything is up. Should I worry?