The Harlequin Rasbora is fairly popular, because it is a hardy community fish that can tolerate variations in pH levels. It originates from the Thailand and Malaysia area. It has a pinkish body with a black triangle filling most of its back half. It likes lots of plants and dim lighting, which actually helps enhance its color. 

Diet Requirements:

they will accept many small foods such as brine shrimp or daphnia, freeze-dried bloodworms and tubifex, micro pellet food, and a high quality flake food.

Compatibility: Peaceful

Recommendations:

compatible with Black Phantom Tetras, Cardinal Tetras, Catfish, Chinese Algae Eaters, Ghost Shrimp, Glass Fish, Glow Light Tetras, Guppies, Honey Gouramis, Neon Tetras, Plecos, one Red Tailed Shark, White Cloud Mountain Minnows