This shrimp is a Gnathophyllum americanum. This shrimp stays pretty small and only grows to around an inch long. This one is around 0.75 of an inch and is really cute. They are reef safe and would do well in a nano tank. They are rather shy, but are perfect for a nano sized tank where they is not as many places to hide. They could be eaten by larger fish since they are so small. There is a dime shown in this picture to give you an idea of its size.