This aquarium video is called Puntius conchonius and lettuce.
From Practical Fishkeeping:
The Lipstick barb is among one of five new species of barbs described from northern Myanmar by Sven Kullander in the most recent issue of the journal Ichthyological Exploration of Freshwaters.
The five species are all found in small streams in the Irrawaddy River drainage and in Lake Indawgyi and are characterized by a prominent blotch or band around the caudal peduncle.
The Lipstick barb is distinguished from congeners in having a dark band around the caudal peduncle, an abbreviated lateral line, males with tuberculate reddish snout and absence of barbels.
The name comes from the red snout in males (Greek erythros=red and mykter=upper lip).