Can oscars live with dwarf neon rainbowfish?

Verdict

No. Oscars and dwarf neon rainbowfish should not share a tank. An adult oscar eats fish that fit in its mouth, and at 2.5 inches dwarf neon rainbowfish do.

Oscar74–81°F · pH 6–8

Dwarf neon rainbowfish75–82°F · pH 6.5–7.5

What to watch

Deal breakerAn adult oscar eats fish that fit in its mouth, and at 2.5 inches dwarf neon rainbowfish do.

What works

Both are fine at 75–81°F.
pH 6.5–7.5 suits both.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

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

	Oscar	Dwarf neon rainbowfish
Temperature	74–81 °F	75–82 °F
pH	6–8	6.5–7.5
Adult size	12.0 in	2.5 in
Minimum tank	75 gal	20 gal
Temperament	Semi-aggressive	Peaceful
Swims at	Middle	Middle
Group	Alone or in pairs	Groups of 6+
Diet	Carnivore	Omnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can oscars live with dwarf neon rainbowfish?

No. Oscars and dwarf neon rainbowfish should not share a tank. An adult oscar eats fish that fit in its mouth, and at 2.5 inches dwarf neon rainbowfish do.

What temperature suits both oscars and dwarf neon rainbowfish?

75–81 °F. Oscars need 74–81 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do oscars and dwarf neon rainbowfish need together?

At least 75 gal, set by the oscar. Add space for each extra fish.