Can black ghost knives live with dojo loaches?

Verdict

No. Black ghost knives and dojo loaches should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 6 inches dojo loaches do.

Black ghost knife73–82°F · pH 6–8

Dojo loach59–77°F · pH 6.5–8

What to watch

Deal breakerAn adult black ghost knife eats fish that fit in its mouth, and at 6 inches dojo loaches do.

What works

Both are fine at 73–77°F.
pH 6.5–8 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

	Black ghost knife	Dojo loach
Temperature	73–82 °F	59–77 °F
pH	6–8	6.5–8
Adult size	15.0 in	6.0 in
Minimum tank	125 gal	55 gal
Temperament	Semi-aggressive	Peaceful
Swims at	Bottom	Bottom
Group	One per tank	Groups of 3+
Diet	Carnivore	Omnivore

Better tank mates for black ghost knives

All black ghost knife tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can black ghost knives live with dojo loaches?

No. Black ghost knives and dojo loaches should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 6 inches dojo loaches do.

What temperature suits both black ghost knives and dojo loaches?

73–77 °F. Black ghost knives need 73–82 °F, dojo loaches need 59–77 °F.

What size tank do black ghost knives and dojo loaches need together?

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