Can red tail sharks live with flowerhorns?

Verdict
No

No. Red tail sharks and flowerhorns should not share a tank. No shared temperature. Red tail sharks need 72–79°F, flowerhorns need 80–89°F.

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Red tail shark 72–79°Flowerhorn 80–89°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–7.5Red tail shark 6.5–7.5Flowerhorn 7–8
The green band is the pH both tolerate.

Size to scale

Red tail shark · 5 inFlowerhorn · 12 in0"2"4"6"8"10"12"
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

Red tail sharkFlowerhorn
Temperature72–79 °F80–89 °F
pH6.5–7.57–8
Adult size5.0 in12.0 in
Minimum tank55 gal75 gal
TemperamentSemi-aggressiveAggressive
Swims atBottomMiddle
GroupOne per tankOne per tank
DietOmnivoreCarnivore

Better tank mates for red tail sharks

All red tail shark tank mates

Questions

Can red tail sharks live with flowerhorns?

No. Red tail sharks and flowerhorns should not share a tank. No shared temperature. Red tail sharks need 72–79°F, flowerhorns need 80–89°F.

What temperature suits both red tail sharks and flowerhorns?

None. Red tail sharks need 72–79 °F and flowerhorns need 80–89 °F, so the ranges do not meet.

What size tank do red tail sharks and flowerhorns need together?

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