Can guppies live with zebra loaches?

Verdict
Yes

Yes. Guppies and zebra loaches make a good pair. Both are fine at 73–79°F. Plan on at least 30 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 Zebra loachZebra loach73–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Guppy 72–82°Zebra loach 73–79°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Zebra loach 6–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inZebra loach · 3.5 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

GuppyZebra loach
Temperature72–82 °F73–79 °F
pH6.8–7.86–7.5
Adult size2.0 in3.5 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 3+Groups of 5+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for zebra loaches

All zebra loach tank mates

Questions

Can guppies live with zebra loaches?

Yes. Guppies and zebra loaches make a good pair. Both are fine at 73–79°F. Plan on at least 30 gal.

What temperature suits both guppies and zebra loaches?

73–79 °F. Guppies need 72–82 °F, zebra loaches need 73–79 °F.

What size tank do guppies and zebra loaches need together?

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