:notsure:
I am sure they would be hanging out in stuff like that, but I am not sure how you could tell for sure they were eating them. They aren't large...and just being there doesn't mean they are doing it. But most as I know it are detritovores...good guys...now if things are dying for whatever reason - yeah, they'll be right there too taking advantage of that (clean up), but if they are the cause well that it more the question.
Maybe BangGuy, with his vast crustacean knowledge, will jump in :yes: