Red-bellied Piranha
Pygocentrus nattereri
Red-bellied Piranha (Pygocentrus nattereri) — Varies care, Peaceful, under Other. Minimum tank in the app: 160 US gal min; aim for 75–82°F and pH 6.5–7.5. The Red-bellied Piranha is best suited for experienced aquarists who appreciate dynamic, semi-aggressive species.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South America
- South America
Regional colours match the stocking calculator’s origin map.
Red-bellied Piranha Tank Setup
To accommodate the Red-bellied Piranha, create a spacious environment with a mix of open swimming areas and dense vegetation or rock formations for cover. Ensure robust filtration to handle their bioload and maintain water quality, and consider subdued lighting to mimic their natural habitat. A sandy substrate is ideal, facilitating foraging behaviors while allowing for easy cleanup.
What Do Red-bellied Piranhas Eat?
These omnivores can exhibit competitive feeding behaviors, particularly when hungry. They tend to eat quickly, so providing a varied diet with high-quality pellets, frozen foods, and occasional plant matter can promote health and coloration.
Red-bellied Piranha Tank Mates
Ideal tank mates include similarly sized, semi-aggressive fish that occupy different swimming zones or have complementary behaviors, such as larger cichlids or robust catfish. Avoid smaller or overly timid species, as they may be seen as prey. Intraspecies interactions can vary, with larger individuals sometimes displaying dominance, so keeping a single specimen or a balanced group is crucial to minimize aggression.
Are Red-bellied Piranhas Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate the space required for Red-bellied Piranhas, leading to stunted growth and increased aggression. Insufficient filtration can exacerbate waste issues, while neglecting to provide adequate cover may increase stress levels and territorial disputes, negatively impacting their health.
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