Can blood parrots live with black ghost knives?

Verdict

No. Blood parrots and black ghost knives should not share a tank. An adult black ghost knife is twice the size of a blood parrot and will hunt or batter a slow, long-finned fish like this.

Blood parrot76–80°F · pH 6.5–7.5

Black ghost knife73–82°F · pH 6–8

What to watch

Deal breakerAn adult black ghost knife is twice the size of a blood parrot and will hunt or batter a slow, long-finned fish like this.

What works

Both are fine at 76–80°F.
pH 6.5–7.5 suits both.
They use different parts of the tank: blood parrots the mid, black ghost knives the bottom.

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

	Blood parrot	Black ghost knife
Temperature	76–80 °F	73–82 °F
pH	6.5–7.5	6–8
Adult size	8.0 in	15.0 in
Minimum tank	55 gal	125 gal
Temperament	Semi-aggressive	Semi-aggressive
Swims at	Middle	Bottom
Group	Alone or in pairs	One per tank
Diet	Omnivore	Carnivore

Better tank mates for blood parrots

All blood parrot tank mates

Better tank mates for black ghost knives

All black ghost knife tank mates

Questions

Can blood parrots live with black ghost knives?

No. Blood parrots and black ghost knives should not share a tank. An adult black ghost knife is twice the size of a blood parrot and will hunt or batter a slow, long-finned fish like this.

What temperature suits both blood parrots and black ghost knives?

76–80 °F. Blood parrots need 76–80 °F, black ghost knives need 73–82 °F.

What size tank do blood parrots and black ghost knives need together?

At least 125 gal, set by the black ghost knife. Add space for each extra fish.