Can bala sharks live with black ghost knives?

Verdict
Yes

Yes, bala sharks and black ghost knives can live together. Both are fine at 73–82°F. Plan on at least 125 gal.

Bala sharkBala shark72–82°F · pH 6.5–7.5 Black ghost knifeBlack ghost knife73–82°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–82°Bala shark 72–82°Black ghost knife 73–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Bala shark 6.5–7.5Black ghost knife 6–8
The green band is the pH both tolerate.

Size to scale

Bala shark · 13 inBlack ghost knife · 15 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

Bala sharkBlack ghost knife
Temperature72–82 °F73–82 °F
pH6.5–7.56–8
Adult size13.0 in15.0 in
Minimum tank125 gal125 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleBottom
GroupGroups of 4+One per tank
DietOmnivoreCarnivore

Better tank mates for bala sharks

All bala shark tank mates

Better tank mates for black ghost knives

All black ghost knife tank mates

Questions

Can bala sharks live with black ghost knives?

Yes, bala sharks and black ghost knives can live together. Both are fine at 73–82°F. Plan on at least 125 gal.

What temperature suits both bala sharks and black ghost knives?

73–82 °F. Bala sharks need 72–82 °F, black ghost knives need 73–82 °F.

What size tank do bala sharks and black ghost knives need together?

At least 125 gal, set by the bala shark. Add space for each extra fish.