Can black ghost knives live with endlers?

Verdict
No

No. Black ghost knives and endlers should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 1 inches endlers do.

Black ghost knifeBlack ghost knife73–82°F · pH 6–8 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–82°Black ghost knife 73–82°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–8Black ghost knife 6–8Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Black ghost knife · 15 inEndler's livebearer · 1 in0"2"4"6"8"10"12"14"
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 knifeEndler's livebearer
Temperature73–82 °F72–82 °F
pH6–87–8
Adult size15.0 in1.0 in
Minimum tank125 gal5 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomTop
GroupOne per tankGroups of 3+
DietCarnivoreOmnivore

Better tank mates for black ghost knives

All black ghost knife tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can black ghost knives live with endlers?

No. Black ghost knives and endlers should not share a tank. An adult black ghost knife eats fish that fit in its mouth, and at 1 inches endlers do.

What temperature suits both black ghost knives and endlers?

73–82 °F. Black ghost knives need 73–82 °F, endlers need 72–82 °F.

What size tank do black ghost knives and endlers need together?

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