Dwarf pufferfish
Carinotetraodon travancoricus
intermediate careOverview
The dwarf pufferfish (Carinotetraodon travancoricus) is the smallest puffer in the trade — a 3 cm bundle of personality that hovers, hunts and eyeballs its keeper like a fish ten times its size. It is enormously appealing, but it is a specialist: a fin-nipping micro-predator that wants a species tank, a steady supply of snails and a meaty diet. Meet those needs and it is one of the most engaging nano fish you can keep.
Tank & water
Keep one puffer in a planted 38 litres (10 gallons), adding roughly 19 litres per extra fish.
- Temperature: 24–28 °C from a small heater.
- Water: neutral to slightly alkaline, pH 7.0–8.0; note this is pure freshwater — they are not brackish. Test with a kit.
- Heavily planted: dense plants and cover break sightlines, reduce aggression and give this inquisitive fish territory to patrol.
- Gentle, mature filtration: a low-flow filter in a fully cycled tank, plus regular water changes.
Feeding
Dwarf pufferfish are carnivores that hunt live prey. Offer small pest snails regularly, plus frozen bloodworm, blackworm and brine shrimp, and live foods where possible; browse fish food options. They almost never take dry flakes or pellets. Feed daily but modestly — they are prone to overeating — and watch their belly and beak condition.
Tankmates
Assume a species-only tank. Their fin-nipping makes them a poor community fish, and slow or long-finned tankmates suffer badly. If you keep several puffers, provide a heavily planted tank with more females than males and plenty of sightline breaks to spread aggression. Snails and, sometimes, fast-moving otocinclus are the usual exceptions, though nothing is guaranteed safe. For temperament planning, see why is my fish hiding.
Dwarf pufferfish — frequently asked questions
Do dwarf pufferfish need a species-only tank?
In most cases, yes. Dwarf puffers are curious, feisty fin-nippers that harass and bite the fins of tankmates despite their tiny size. A planted species-only tank — one puffer per 20 or so litres, with more females than males — is the reliable way to keep them well.
Why do dwarf pufferfish need snails?
They are snail specialists. Regular access to small pest snails helps wear down their continuously growing beak-like teeth and provides natural enrichment and food. Keep a snail colony going in a separate tank so you always have a supply to feed them.
Will dwarf pufferfish eat flake food?
Rarely — they almost always refuse dry foods. They need a meaty diet of snails, frozen bloodworm and brine shrimp, and live foods. This live and frozen requirement, plus their fin-nipping, is why they suit a dedicated keeper rather than a general community.
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