The Cleaner Shrimp
Cleaner Shrimp will set up a cleaning station on coral reefs or rubble, waiting for fish to come and be cleaned. It feeds on parasites or dead tissue that it picks from the body and oral cavities/gills of these fish (e.g.; Tangs or Groupers) in the wild or in the aquarium. This also helps to protect the fish from contracting diseases and infections. Many fish value its services so highly that they will allow it to clean the inside of their mouths, and not harm it.