Can pea puffers live with killifish?

Verdict

Yes, with care

Yes, with care. Pea puffers and killifish can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

Pea puffer74–82°F · pH 7–8

Killifish70–77°F · pH 5.5–7

What to watch

Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.
Watch outPea puffers are aggressive, though killifish are big enough to shrug most of it off.

What works

Both are fine at 74–77°F.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

	Pea puffer	Killifish
Temperature	74–82 °F	70–77 °F
pH	7–8	5.5–7
Adult size	1.0 in	2.5 in
Minimum tank	5 gal	10 gal
Temperament	Aggressive	Peaceful
Swims at	All levels	Top
Group	Alone or in pairs	Alone or in pairs
Diet	Carnivore	Carnivore

Better tank mates for pea puffers

CrayfishYes

All pea puffer tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can pea puffers live with killifish?

Yes, with care. Pea puffers and killifish can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

What temperature suits both pea puffers and killifish?

74–77 °F. Pea puffers need 74–82 °F, killifish need 70–77 °F.

What size tank do pea puffers and killifish need together?

At least 10 gal, set by the killifish. Add space for each extra fish.