Can hillstream loaches live with swordtails?

Verdict
Yes

Yes. Hillstream loaches and swordtails get along in the same tank. Both are fine at 72–75°F. Plan on at least 30 gal.

Hillstream loachHillstream loach68–75°F · pH 6.5–7.5 SwordtailSwordtail72–79°F · pH 7–8.3

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–75°Hillstream loach 68–75°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–7.5Hillstream loach 6.5–7.5Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Hillstream loach · 2.5 inSwordtail · 5 in0"1"2"3"4"5"6"
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 loachSwordtail
Temperature68–75 °F72–79 °F
pH6.5–7.57–8.3
Adult size2.5 in5.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupGroups of 3+Groups of 3+
DietHerbivoreOmnivore

Better tank mates for hillstream loaches

All hillstream loach tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can hillstream loaches live with swordtails?

Yes. Hillstream loaches and swordtails get along in the same tank. Both are fine at 72–75°F. Plan on at least 30 gal.

What temperature suits both hillstream loaches and swordtails?

72–75 °F. Hillstream loaches need 68–75 °F, swordtails need 72–79 °F.

What size tank do hillstream loaches and swordtails need together?

At least 30 gal, set by the swordtail. Add space for each extra fish.