Siamese Algae Eater (lat. Crossocheilus oblongus) is a fish of the Cyprinidae family. It is often called SAE, which is an abbreviation from its full name. It is used in aquarium husbandry as a natural way of fighting unwanted algae. It is considered the most efficient of all known algae eaters. The fish is peaceful, not very large, and it is a true tank cleaner. It eats algae in a tank, and this task is quite challenging since not every fish can do it.