Can hillstream loaches live with flowerhorns?

Verdict
No

No. Hillstream loaches and flowerhorns should not share a tank. No shared temperature. Hillstream loaches need 68–75°F, flowerhorns need 80–89°F.

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Hillstream loach 68–75°Flowerhorn 80–89°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–7.5Hillstream loach 6.5–7.5Flowerhorn 7–8
The green band is the pH both tolerate.

Size to scale

Hillstream loach · 2.5 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

Hillstream loachFlowerhorn
Temperature68–75 °F80–89 °F
pH6.5–7.57–8
Adult size2.5 in12.0 in
Minimum tank20 gal75 gal
TemperamentPeacefulAggressive
Swims atBottomMiddle
GroupGroups of 3+One per tank
DietHerbivoreCarnivore

Better tank mates for hillstream loaches

All hillstream loach tank mates

Questions

Can hillstream loaches live with flowerhorns?

No. Hillstream loaches and flowerhorns should not share a tank. No shared temperature. Hillstream loaches need 68–75°F, flowerhorns need 80–89°F.

What temperature suits both hillstream loaches and flowerhorns?

None. Hillstream loaches need 68–75 °F and flowerhorns need 80–89 °F, so the ranges do not meet.

What size tank do hillstream loaches and flowerhorns need together?

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