What is the shrimp that eats parasites on fish?

You're thinking of cleaner shrimp, also known as symbiotic shrimp. These shrimp are known for their cleaning behavior, where they eat parasites and dead tissue from fish, often forming a symbiotic relationship with them.

There are many species of cleaner shrimp, but some of the most common include:

* Yellow Watchman Goby: This small, bright yellow shrimp is commonly found in aquariums and is known for its cleaning behavior.

* Tiger Pistol Shrimp: While not as common as the Yellow Watchman Goby, these shrimp are also known to clean fish.

It's important to note that not all shrimp species are cleaner shrimp. Some shrimp are scavengers or predators.