Redtail garra fish have siskin and olive green scales that abruptly transition to bright orange and red along the tail, making them easy to spot at the bottom of clear streams. Credit: Tangjitjaroen et al. (2023). With just a few clicks of a mouse, you can purchase your very own redtail garra, a type of fish that feeds on algae. Information about the fish's biology, however, is much less easily obtained. That's because redtail garra, although popular in the aquarium trade since the early 2000s, has until now been unknown to science. Researchers were peripherally aware of the fish's existence,...