Can bolivian rams live with killifish?

Verdict
Yes

Yes. Bolivian rams and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

Bolivian ramBolivian ram72–79°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°Bolivian ram 72–79°Killifish 70–77°
The green band is the temperature range both can live in.
456789Both: 6–7Bolivian ram 6–7.5Killifish 5.5–7
The green band is the pH both tolerate.

Size to scale

Bolivian ram · 3 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

Bolivian ramKillifish
Temperature72–79 °F70–77 °F
pH6–7.55.5–7
Adult size3.0 in2.5 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupAlone or in pairsAlone or in pairs
DietOmnivoreCarnivore

Better tank mates for bolivian rams

All bolivian ram tank mates

Better tank mates for killifish

All killifish tank mates

Questions

Can bolivian rams live with killifish?

Yes. Bolivian rams and killifish make a good pair. Both are fine at 72–77°F. Plan on at least 20 gal.

What temperature suits both bolivian rams and killifish?

72–77 °F. Bolivian rams need 72–79 °F, killifish need 70–77 °F.

What size tank do bolivian rams and killifish need together?

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