This is a peppermint shrimp. It is hard to see in this picture, but peppermint shrimp have red and white stripes like a peppermint stick. The peppermint shrimp is a cleaner shrimp, like the scarlet cleaner shrimp, which means that it cleans other animals by eating parasites and dead tissue. They are common in salt water reef aquariums. Its eggs are bright green. Peppermint shrimp are crustaceans.
I saw this fish at SeaWorld‘s Manta Aquarium. In the picture you can also see a cleaner wrasse which is a fish just below and to the right of the shrimp and also cleans other fish just like a cleaner shrimp. You can see part of a sea anemone just below and to the left of the shrimp.