Crossocheilus oblongus (formerly C. siamensis) hails from Southeast Asia and looks like a miniature freshwater shark because of its torpedo-shaped profile and sharp snout. Both sexes have very similar appearances, except the female may have a chunkier body because of her ability to produce eggs. Besides its algae-eating abilities, the SAE's eye-catching appearance and active swimming behavior makes it a fish store favorite, and this species reportedly has a longer lifespan compared to other smaller fish.
What is the difference between the Siamese algae eater, Chinese algae, eater, and flying fox? 
The Siamese algae eater grows to 6 inches (15 cm) long and has a bold, black line down its side with a tannish-gray back and lighter-colored belly. It has a pointy face and shark-like body, and its fins and tail are completely clear.
The Chinese algae eater can reach 11 inches (28 cm) in length and has a large suckermouth (instead a pointed mouth like the SAE). The regular version is brown in color with a bumpy black stripe down the middle, whereas the gold variety is entirely golden-yellow without any black stripe.
The flying fox is much more similar to the SAE in appearance because of its 6-inch (15 cm), shark-like profile. However, it has a thin, shiny gold line that looks like it’s surrounded by two black stripes. Also, the fins are not clear but instead have black markings on them.