Can pea puffers live with hatchetfish?

Verdict
No

No. Pea puffers and hatchetfish should not share a tank. Pea puffers are aggressive and will bully peaceful hatchetfish.

Pea pufferPea puffer74–82°F · pH 7–8 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Pea puffer 74–82°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 7–7.5Pea puffer 7–8Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Pea puffer · 1 inHatchetfish · 1.5 in0"1"2"3"4"5"6"
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 pufferHatchetfish
Temperature74–82 °F75–81 °F
pH7–85.5–7.5
Adult size1.0 in1.5 in
Minimum tank5 gal20 gal
TemperamentAggressivePeaceful
Swims atAll levelsTop
GroupAlone or in pairsGroups of 6+
DietCarnivoreCarnivore

Better tank mates for pea puffers

All pea puffer tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can pea puffers live with hatchetfish?

No. Pea puffers and hatchetfish should not share a tank. Pea puffers are aggressive and will bully peaceful hatchetfish.

What temperature suits both pea puffers and hatchetfish?

75–81 °F. Pea puffers need 74–82 °F, hatchetfish need 75–81 °F.

What size tank do pea puffers and hatchetfish need together?

At least 20 gal, set by the hatchetfish. Add space for each extra fish.