What is the relationship between a moray eel and cleaner fish?

The moray eel and cleaner fish have a symbiotic relationship, known as a cleaning symbiosis. In this type of relationship, one species benefits from the services of another species, while the other species gains no direct benefit but also does not suffer any harm. The cleaner fish perform a cleaning service for the moray eel, removing parasites, dead tissue, and other debris from its skin and gills. This service helps to keep the eel healthy and free from infection. The cleaner fish, on the other hand, gains access to a source of food from the moray eel's body, which it would not be able to find on its own. The moray eel also benefits from the cleaner fish's presence since the cleaner fish can warn it of approaching predators.