What fish can live with Pea Puffer?

Species-only is the safest plan: one male with two or three females in a 40 L or larger planted tank. They hunt shrimp, snails, fry, and nip fins on any tank mate, so common community fish like neons, guppies, corydoras, and shrimp will not survive long term.

What tank mates should you avoid with Pea Puffer?

Avoid Neon Tetra, Guppy, Amano Shrimp, Corydoras Catfish, Betta, Chili Rasbora based on size, temperament, or predation risk on file.

What size tank do Pea Puffer need for a community?

40L is the planning floor for adult swimming space and bioload headroom. Long-term, a 49L+ tank lets adults use the full footprint without crowding the next species. Footprint, meaning length and front-to-back depth, matters as much as raw volume for active or territorial species.

Pea Puffer tank mates

A 3 cm puffer with a beak built for snails and small shrimp. Nips fins on principle; most working setups are species-only. Any community plan needs every tank mate vetted by behaviour, not just litres.

Evidence: verified

Confidence: high

Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.

← Full Pea Puffer profile·Compatibility checker·Tank builder·More oddball

Best tank mates (on file)

Merged from conservative safest and best with fields — de-duplicated by species.

Bristlenose Pleco Pair check
The Pea Puffer profile lists Bristlenose Pleco as both safe and a recommended pairing. Bristlenose Pleco grows bigger than Pea Puffer (15cm vs 3cm). Stock the Pea Puffer group large enough to outnumber the Bristlenose Pleco, or the smaller fish ends up bullied or off food. Bristlenose Pleco swims in the bottom zone while Pea Puffer stays in the middle, so the two will not crowd the same water column.

Risky or situational

From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.

None on file beyond the safe list.

Fish to avoid with Pea Puffer

From the unsafe list — predation, aggression, or space rules on this profile.

Neon Tetra See why (pair)
Neon Tetra conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Guppy See why (pair)
Guppy conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Amano Shrimp See why (pair)
Amano Shrimp conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Corydoras Catfish See why (pair)
Corydoras Catfish conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Betta See why (pair)
Betta conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Chili Rasbora See why (pair)
Chili Rasbora conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Pygmy Corydoras See why (pair)
Pygmy Corydoras conflicts with Pea Puffer on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.

Tank size and groups

Published minimum for Pea Puffer: 40L — group minimum 6 .
Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
Nearest litre hub to this minimum: 40L hub.

Easier alternatives to consider

Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.

Plan before you buy

Pair checks for every mix, then multi-species stocking in the builder.

Open compatibility checker Tank builder

Filtration & heating

A 40L minimum tank for Pea Puffer needs a filter rated for at least 160L/hr turnover and a heater maintaining 24–28°C.

Filter buying guide →Heater buying guide →Beginner plants guide →