Peppermint shrimp (Lysmata wundermanni) are great little shrimp to have in a saltwater aquarium. They feed on Aiptasia anemones, and when those are gone they eat leftover food and detritus. Be careful though, as some have been reported to go after the soft tissue of some corals.
Here’s a video of a group of peppermint shrimp in action, devouring an Aiptasia anemone. This video is courtesy of Reef Scavengers via YouTube.
Permissions and Sources:
Reef Scavengers