Can jack dempseys live with rummy nose tetras?

Verdict

No. Jack dempseys and rummy nose tetras should not share a tank. An adult jack dempsey eats fish that fit in its mouth, and at 2 inches rummy nose tetras do.

Jack Dempsey72–86°F · pH 6.5–7.5

Rummy nose tetra75–84°F · pH 5.5–7

What to watch

Deal breakerAn adult jack dempsey eats fish that fit in its mouth, and at 2 inches rummy nose tetras do.
Deal breakerJack dempseys are aggressive and will bully peaceful rummy nose tetras.

What works

Both are fine at 75–84°F.
pH 6.5–7 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

	Jack Dempsey	Rummy nose tetra
Temperature	72–86 °F	75–84 °F
pH	6.5–7.5	5.5–7
Adult size	10.0 in	2.0 in
Minimum tank	55 gal	20 gal
Temperament	Aggressive	Peaceful
Swims at	Middle	Middle
Group	Alone or in pairs	Groups of 6+
Diet	Carnivore	Omnivore

Better tank mates for jack dempseys

CrayfishYes

All jack dempsey tank mates

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Questions

Can jack dempseys live with rummy nose tetras?

No. Jack dempseys and rummy nose tetras should not share a tank. An adult jack dempsey eats fish that fit in its mouth, and at 2 inches rummy nose tetras do.

What temperature suits both jack dempseys and rummy nose tetras?

75–84 °F. Jack dempseys need 72–86 °F, rummy nose tetras need 75–84 °F.

What size tank do jack dempseys and rummy nose tetras need together?

At least 55 gal, set by the jack dempsey. Add space for each extra fish.