Amazon Puffer

Colomesus asellus

Amazon Puffer (Colomesus asellus) — Advanced care, Aggressive, under Other. Minimum tank in the app: 26 US gal min; aim for 72–82°F and pH 7–8. The Amazon Puffer is an engaging choice for experienced aquarists seeking a dynamic, predatory species.

Amazon Puffer (Colomesus asellus) in a planted freshwater aquarium
Care levelAdvanced
TemperamentAggressive
Min tank size26 US gal min
pH range7–8
Temperature72–82°F
Max size4.7 in (12.0 cm)
Captive lifespan5–10 years
SchoolingNo

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.

Natural distribution

Asia / South America

  • East & Southeast Asia
  • South America

Regional colours match the stocking calculator’s origin map.

Amazon Puffer Tank Setup

Create an environment that balances open swimming space with plenty of hiding spots to alleviate stress. Use a sandy substrate to mimic its natural habitat, and incorporate driftwood or rock formations for shelter. Moderate water flow and subdued lighting can also encourage natural behaviors and reduce aggression.

What Do Amazon Puffers Eat?

Feeding is typically aggressive, as this carnivorous species actively hunts for snails and crustaceans. It may compete for food if housed with faster or more assertive feeders.

Amazon Puffer Tank Mates

Best kept alone due to its predatory nature, the Amazon Puffer poses risks to smaller or slower tankmates, particularly those with delicate fins. Avoid pairing with long-finned species, as they are likely to become targets. Intraspecies interactions are minimal as they do not shoal; aggression is typically directed towards different species.

Are Amazon Puffers Good for Beginners?

This sits in the advanced range in the app. Strong filtration, stable chemistry, and reading up before purchase matter more than a catchy shop name. Aquarists often underestimate the Amazon Puffer's aggression, leading to poor tankmate choices that result in stress or injury. Neglecting to provide adequate hiding spots can exacerbate its territorial behavior.

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