The True Siamese Algae Eater (Crossocheilus siamensis) is one of the most popular algae eaters, especially to help control nuisance algaes in planted aquariums. Its similarity to others in its genus can lead to confusion with its identification however and the "true" Crossocheilus siamensis is not avialble often. This species has a black stripe running from the tip of its head all the way through its tail.
Crossocheilus algae eaters are native to high-flow rivers and streams and need a steady current and high oxygen levels to thrive in the aquarium. They do not tolerate subpar water conditions with high nitrate and dissolved organics so water parameters must be maintained pristine.
These fish are true algae eaters and graze on the surface of the substrate, plants and decor. They will also feed on the nuisance "Black Beard Algae" plaguing some systems. Their diet should consist of plant matters like Spirulina flakes or wafers and fresh veggies like peas or zucchini as well as algae growign in the aquarium. Avoid high protein (ie. meaty) diets.