Pea Puffer Care Guide
3 min read · Updated Jun 2026
Pea puffers (Carinotetraodon travancoricus) are the world's smallest pufferfish — barely an inch long, endlessly curious, and full of personality. They are also pickier than they look. Here is how to keep them thriving.
In this guide
Species Snapshot
- Tank size
- 5+ gallons
- Temperature
- 74-82°F
- pH
- 6.5-7.5
- GH
- 8-15 dGH
- Difficulty
- Intermediate
- Lifespan
- 4 years
- Adult size
- 1 in
- Diet
- Carnivore (snails)
Pea puffers pack an absurd amount of personality into a one-inch body. They track your finger across the glass, hunt snails with real intent, and each one has a visibly different temperament. But they are not a beginner's first fish by accident — their diet and temperament demand a bit more planning than a typical nano fish.
What you need
A pea puffer setup is a small, heavily planted, gently filtered tank with a reliable food source of snails. The planting is not decoration — it breaks up sightlines and is essential for managing their aggression.
Aqueon 5 Gallon Glass Aquarium
A 5-gallon footprint is the practical minimum for a stable nano shrimp or betta tank.
A 5 gallon works for a single puffer. If you dream of a small group, size up early — crowding a group into too small a tank is the fastest route to bullying and deaths.
Tank size and setup
Stocking pea puffers is about territory, not just water volume. Rule of thumb: roughly 3-5 gallons of well-planted space per puffer in a group, with one puffer per 5 gallons being the safest starting point. Dense plants, driftwood, and rock create the visual barriers that let multiple puffers coexist.
Cycle the tank fully before adding any puffer. They are sensitive carnivores and do poorly in unstable water.
Hygger Aquarium Double Sponge Filter (Small)
Shrimp-safe filtration with no intake tube to suck in babies; gentle flow bettas love.
A gentle sponge filter suits them well — pea puffers are weak swimmers and dislike strong current.
Water parameters
Keep the temperature at 74-82°F, pH between 6.5 and 7.5, and GH in the 8-15 range. Stability matters more than chasing an exact number. A small heater is non-negotiable in most homes.
Eheim Jager 50W Heater
Accurate German-made heater with a reliable thermostat for small tanks.
Diet and feeding
This is where most pea puffer attempts fail. Pea puffers will not eat flakes or pellets. They are micro-predators that need small, meaty, live or frozen food:
- Bladder and ramshorn snails (their favorite — and it keeps their beak worn down)
- Frozen bloodworms
- Frozen brine shrimp
- Occasionally live blackworms
Most experienced keepers run a separate snail culture (a jar or a corner of another tank) so they always have appropriately sized snails on hand. Feed small amounts once or twice a day.
Common mistakes
- Trying to feed flakes or pellets — pea puffers will simply starve rather than eat dry food
- Adding them to a community tank, then losing tank mates to fin-nipping
- Skipping snails, which lets their beak overgrow until they cannot eat
- Understocking plants, so puffers have no way to escape each other's line of sight
Tank mates
The honest recommendation is a species-only tank. Pea puffers are fin-nippers with a big attitude for their size, and most "puffer-safe" community attempts end badly. If you must try, fast mid-water dither fish like chili rasboras can sometimes redirect aggression — but watch closely and have a backup plan.
Plants and aquascape
Lean into a jungle. Java moss, Anubias, and floating plants give cover, dim the light puffers prefer, and grow the biofilm pest snails feed on.
Java Moss (Portion)
Shrimp graze the biofilm it grows and babies hide in it — a shrimp-tank staple.
Spec a planted nano tank
Use our Tank Builder to get a complete planted nano setup — tank, gentle filter, heater, light, and substrate.
Build my tank kit →Common health issues
A healthy, well-fed pea puffer is hardy. The two things to watch are an overgrown beak (from no hard-shelled food — feed snails) and constipation or bloating from overfeeding. Because they are scaleless puffers, dose any medication carefully and never use copper.
Recommended products
API Freshwater Master Test Kit
Liquid tests for pH, ammonia, nitrite, and nitrate — essential for cycling and ongoing care.
Seachem Prime Water Conditioner
The gold standard dechlorinator — also detoxifies ammonia and nitrite during cycling.
Give a pea puffer a planted tank, stable warm water, and a steady supply of snails, and you get one of the most entertaining one-inch animals in the hobby.