Can glass catfish live with firemouth cichlids?

Verdict
Yes

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

Glass catfishGlass catfish75–80°F · pH 6.5–7.5 Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Glass catfish 75–80°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Glass catfish 6.5–7.5Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Glass catfish · 3 inFiremouth cichlid · 6 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

Glass catfishFiremouth cichlid
Temperature75–80 °F75–86 °F
pH6.5–7.56.5–8
Adult size3.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietCarnivoreOmnivore

Better tank mates for glass catfish

All glass catfish tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can glass catfish live with firemouth cichlids?

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

What temperature suits both glass catfish and firemouth cichlids?

75–80 °F. Glass catfish need 75–80 °F, firemouth cichlids need 75–86 °F.

What size tank do glass catfish and firemouth cichlids need together?

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