TankmateChecker

Can crayfish live with flowerhorns?

Verdict

No

No. Crayfish and flowerhorns should not share a tank. No shared temperature. Crayfish need 65–77°F, flowerhorns need 80–89°F.

Crayfish

Crayfish65–77°F · pH 6.5–8

Flowerhorn

Flowerhorn80–89°F · pH 7–8

What to watch

Deal breakerNo shared temperature. Crayfish need 65–77°F, flowerhorns need 80–89°F.
Deal breakerAn adult flowerhorn eats fish that fit in its mouth, and at 5 inches crayfish do.

What works

pH 7–8 suits both.
They use different parts of the tank: crayfish the bottom, flowerhorns the mid.

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

	Crayfish	Flowerhorn
Temperature	65–77 °F	80–89 °F
pH	6.5–8	7–8
Adult size	5.0 in	12.0 in
Minimum tank	20 gal	75 gal
Temperament	Aggressive	Aggressive
Swims at	Bottom	Middle
Group	One per tank	One per tank
Diet	Omnivore	Carnivore

Better tank mates for crayfish

All crayfish tank mates

Questions

Can crayfish live with flowerhorns?

No. Crayfish and flowerhorns should not share a tank. No shared temperature. Crayfish need 65–77°F, flowerhorns need 80–89°F.

What temperature suits both crayfish and flowerhorns?

None. Crayfish need 65–77 °F and flowerhorns need 80–89 °F, so the ranges do not meet.

What size tank do crayfish and flowerhorns need together?

At least 75 gal, set by the flowerhorn. Add space for each extra fish.