Can guppies live with glass catfish?

Verdict
Yes

Yes. Guppies and glass catfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 30 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 Glass catfishGlass catfish75–80°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Guppy 72–82°Glass catfish 75–80°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Glass catfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inGlass catfish · 3 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

GuppyGlass catfish
Temperature72–82 °F75–80 °F
pH6.8–7.86.5–7.5
Adult size2.0 in3.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreCarnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for glass catfish

All glass catfish tank mates

Questions

Can guppies live with glass catfish?

Yes. Guppies and glass catfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 30 gal.

What temperature suits both guppies and glass catfish?

75–80 °F. Guppies need 72–82 °F, glass catfish need 75–80 °F.

What size tank do guppies and glass catfish need together?

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