Can rams live with congo tetras?

Verdict
Yes

Yes. Rams and congo tetras make a good pair. Both are fine at 80–82°F. Plan on at least 30 gal.

German blue ramGerman blue ram80–86°F · pH 5–7 Congo tetraCongo tetra73–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 80–82°German blue ram 80–86°Congo tetra 73–82°
The green band is the temperature range both can live in.
456789Both: 6–7German blue ram 5–7Congo tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

German blue ram · 2.5 inCongo tetra · 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

German blue ramCongo tetra
Temperature80–86 °F73–82 °F
pH5–76–7.5
Adult size2.5 in3.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can rams live with congo tetras?

Yes. Rams and congo tetras make a good pair. Both are fine at 80–82°F. Plan on at least 30 gal.

What temperature suits both rams and congo tetras?

80–82 °F. Rams need 80–86 °F, congo tetras need 73–82 °F.

What size tank do rams and congo tetras need together?

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