The Harlequin Rasbora is an extremely desirable aquarium addition thanks to its gorgeous metallic coloration and ease of care. It's not difficult to see why so many hobbyists treasure it. A large school of Harlequin Rasboras fill the upper areas of the aquarium with movement and color so lively and vibrant that even non-hobbyists marvel at the display.The Harlequin Rasbora is easily identified by its characteristic black "pork chop" shaped patch and beautifully lustrous copper/orange body. The distinguishing triangular patch begins near the dorsal fin and comes to a point near the base of the caudal fin. The patch on the male Harlequin Rasbora is slightly rounded at the bottom with an extended tip. In contrast, the patch on the female Harlequin Rasbora is straight. The female Harlequin Rasbora is also larger than the male.