Can platies live with hatchetfish?

Verdict
Yes

Yes, platies and hatchetfish can live together. Both are fine at 75–80°F. Plan on at least 20 gal.

PlatyPlaty70–80°F · pH 7–8.2 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Platy 70–80°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 7–7.5Platy 7–8.2Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Platy · 2.5 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

PlatyHatchetfish
Temperature70–80 °F75–81 °F
pH7–8.25.5–7.5
Adult size2.5 in1.5 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 3+Groups of 6+
DietOmnivoreCarnivore

Better tank mates for platies

All platy tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can platies live with hatchetfish?

Yes, platies and hatchetfish can live together. Both are fine at 75–80°F. Plan on at least 20 gal.

What temperature suits both platies and hatchetfish?

75–80 °F. Platies need 70–80 °F, hatchetfish need 75–81 °F.

What size tank do platies and hatchetfish need together?

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