Can bristlenose plecos live with killifish?

Verdict
Yes

Yes, bristlenose plecos and killifish can live together. Both are fine at 73–77°F. Plan on at least 30 gal.

Bristlenose plecoBristlenose pleco73–81°F · pH 6.5–7.5 KillifishKillifish70–77°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Bristlenose pleco 73–81°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7Bristlenose pleco 6.5–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Bristlenose pleco · 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

Bristlenose plecoKillifish
Temperature73–81 °F70–77 °F
pH6.5–7.55.5–7
Adult size5.0 in2.5 in
Minimum tank30 gal10 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupAlone or in pairsAlone or in pairs
DietHerbivoreCarnivore

Better tank mates for bristlenose plecos

All bristlenose pleco tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can bristlenose plecos live with killifish?

Yes, bristlenose plecos and killifish can live together. Both are fine at 73–77°F. Plan on at least 30 gal.

What temperature suits both bristlenose plecos and killifish?

73–77 °F. Bristlenose plecos need 73–81 °F, killifish need 70–77 °F.

What size tank do bristlenose plecos and killifish need together?

At least 30 gal, set by the bristlenose pleco. Add space for each extra fish.