Synonym of oblongus
THE TRUE SIAMESE ALGAE EATER.
The most apparent difference is the horizontal black stripe running down the body. Both the False Siamensis and Flying Fox have a nice smooth black stripe topped with a gold stripe. The true Siamese ALgae Eater has a ragged, almost zig-zag black stripe running to it's tail, and no gold stripe.
False Siamensis and Flying Fox both have twin pairs of barbells (the little whisker by their mouths), but a true siamese Algae Eater only has 1 pair.
The Siamese Algae Eater is rather blandish gold-brown-silver. But a distinctive marking is along the back, where the black outlines the scales, making the top of the fish appear retulicar.
Another big difference is in behaviour. Both the False Siamensis and Flying Fox are solitary, and may become aggressive to others of its kind. The Siamese Algae Eater, on the other hand, is a peaceful schoaler, and does better in a small group of 4-6.
When a Siamese Algae Eater stops swimming and rests, It doesn't lie flat on it's belly but props itself up slightly with its tail, pelvic and pectoral fins usually on low growing plants like Cryptocorynes.