I see them chasing the Shrimp around and have seen them pick off tiny baby RR FHM. They are not very good at catching the shrimp though. But if they find something that is not able to get away they will readily eat meat. I even have seem them tearing apart and eating steak fat I have tossed in for them.

Goofing off is a slang term for engaging in recreation or an idle pastime while obligations of work or society are neglected........... Wikipedia