The first thing you’ll notice about this fish is the long dark streaks that run over their eye. Top Colorful Freshwater Fish 1 Harlequin Rasbora Harlequin Rasbora reign from the Cyprinidae family, they gained popularity in the 1900s, and feature a vibrant redorange color with black marks on the tails Harlequins are generally small in size but will only appeal to the eye if kept in a school. 2 Neon Tetra Neon Tetras may be small in size, but these beautifully and vibrantly colored freshwater fish can brighten up any tank, thanks to their bright streaks of red and blue When it comes to aesthetics, a large school of Neon Tetra can.
