The Rainbow Shark (Epalzeorhynchos frenatum) is a bold and striking freshwater fish, displaying a sleek dark grey to black body contrasted by vivid red-orange fins — a combination that makes it one of the most visually dramatic fish available for the home aquarium. Despite its name, the Rainbow Shark is not a true shark but a member of the cyprinid family, known for its active, territorial personality and its role as a bottom-dwelling algae grazer. A confident and characterful fish, the Rainbow Shark adds energy and visual impact to medium to large community setups.Care Guide Tank Size: Minimum 200L; territorial and requires space — only one Rainbow Shark per tank unless the aquarium is very large and heavily decorated Water Parameters: pH 6.5–7.5 | Temp 22–26°C | Prefers soft to moderately hard, slightly acidic to neutral water Diet: Omnivorous — sinking pellets, algae wafers, and blanched vegetables; supplement with frozen or live daphnia and brine shrimp Temperament: Semi-aggressive; territorial toward its own kind and similar bottom-dwelling species — avoid housing with other sharks or loaches in smaller tanks Tank Setup: Aquarium with caves, driftwood, and hiding spots to establish territory; open swimming areas also appreciated Skill Level: Intermediate Max Size: 15cm
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