Can white cloud minnows live with black ghost knives?

Verdict

No. White cloud minnows and black ghost knives should not share a tank. White cloud minnows are coldwater animals (60–72°F); black ghost knives need 73–82°F. No temperature suits both.

White cloud minnow60–72°F · pH 6–8

Black ghost knife73–82°F · pH 6–8

What to watch

Deal breakerWhite cloud minnows are coldwater animals (60–72°F); black ghost knives need 73–82°F. No temperature suits both.
Deal breakerAn adult black ghost knife eats fish that fit in its mouth, and at 1.5 inches white cloud minnows do.
Watch outBlack ghost knives grow to 15 inches and need 125 gallons, far more than a tank set up for white cloud minnows.

What works

pH 6–8 suits both.
They use different parts of the tank: white cloud minnows the mid, black ghost knives the bottom.

Water side by side

The ranges do not meet, so one of them would always be too warm or too cold.

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

	White cloud minnow	Black ghost knife
Temperature	60–72 °F	73–82 °F
pH	6–8	6–8
Adult size	1.5 in	15.0 in
Minimum tank	10 gal	125 gal
Temperament	Peaceful	Semi-aggressive
Swims at	Middle	Bottom
Group	Groups of 6+	One per tank
Diet	Omnivore	Carnivore

Better tank mates for white cloud minnows

All white cloud minnow tank mates

Better tank mates for black ghost knives

All black ghost knife tank mates

Questions

Can white cloud minnows live with black ghost knives?

No. White cloud minnows and black ghost knives should not share a tank. White cloud minnows are coldwater animals (60–72°F); black ghost knives need 73–82°F. No temperature suits both.

What temperature suits both white cloud minnows and black ghost knives?

None. White cloud minnows need 60–72 °F and black ghost knives need 73–82 °F, so the ranges do not meet.

What size tank do white cloud minnows and black ghost knives need together?

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