Can black ghost knives live with african dwarf frogs?

Verdict

No. Black ghost knives and african dwarf frogs should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 2.5 inches african dwarf frogs do.

Black ghost knife73–82°F · pH 6–8

African dwarf frog72–82°F · pH 6.5–7.8

What to watch

Deal breakerAn adult black ghost knife eats fish that fit in its mouth, and at 2.5 inches african dwarf frogs do.
Watch outAfrican dwarf frogs eat slowly and nearly blind. Fast black ghost knives will take the food first, so target-feed them.
Watch outBlack ghost knives grow to 15 inches and need 125 gallons, far more than a tank set up for african dwarf frogs.

What works

Both are fine at 73–82°F.
pH 6.5–7.8 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	African dwarf frog
Temperature	73–82 °F	72–82 °F
pH	6–8	6.5–7.8
Adult size	15.0 in	2.5 in
Minimum tank	125 gal	10 gal
Temperament	Semi-aggressive	Peaceful
Swims at	Bottom	Bottom
Group	One per tank	Groups of 2+
Diet	Carnivore	Carnivore

Better tank mates for black ghost knives

All black ghost knife tank mates

Better tank mates for african dwarf frogs

All african dwarf frog tank mates

Questions

Can black ghost knives live with african dwarf frogs?

No. Black ghost knives and african dwarf frogs should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 2.5 inches african dwarf frogs do.

What temperature suits both black ghost knives and african dwarf frogs?

73–82 °F. Black ghost knives need 73–82 °F, african dwarf frogs need 72–82 °F.

What size tank do black ghost knives and african dwarf frogs need together?

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