Amano ShrimpCaridina multidentata was introduced into the world of aquaria by Takashi Amano in the early 1980s. They are usually used in an aquarium because they feed primarily on algae, thus cleaning the aquarium if in large numbers. What is the difference between Standard and Grade B? Our standard Amano are the original form of Caridina multidentata which more or less have a uniform appearance. The standard Amano is difficult to breed under normal water