Can pictus catfish live with killifish?

Verdict
Yes

Yes. Pictus catfish and killifish get along in the same tank. Both are fine at 72–77°F. Plan on at least 55 gal.

Pictus catfishPictus catfish72–79°F · pH 6–7.5 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Pictus catfish 72–79°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Pictus catfish 6–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Pictus catfish · 5 inKillifish · 2.5 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

Pictus catfishKillifish
Temperature72–79 °F70–77 °F
pH6–7.55.5–7
Adult size5.0 in2.5 in
Minimum tank55 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomTop
GroupGroups of 3+Alone or in pairs
DietCarnivoreCarnivore

Better tank mates for pictus catfish

All pictus catfish tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can pictus catfish live with killifish?

Yes. Pictus catfish and killifish get along in the same tank. Both are fine at 72–77°F. Plan on at least 55 gal.

What temperature suits both pictus catfish and killifish?

72–77 °F. Pictus catfish need 72–79 °F, killifish need 70–77 °F.

What size tank do pictus catfish and killifish need together?

At least 55 gal, set by the pictus catfish. Add space for each extra fish.