Can rams live with ember tetras?

Verdict
Yes

Yes. Rams and ember tetras make a good pair. Both are fine at 80–84°F. Plan on at least 20 gal.

German blue ramGerman blue ram80–86°F · pH 5–7 Ember tetraEmber tetra73–84°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 80–84°German blue ram 80–86°Ember tetra 73–84°
The green band is the temperature range both can live in.
456789Both: 5.5–7German blue ram 5–7Ember tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

German blue ram · 2.5 inEmber tetra · 0.8 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 ramEmber tetra
Temperature80–86 °F73–84 °F
pH5–75.5–7
Adult size2.5 in0.8 in
Minimum tank20 gal5 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 ember tetras

All ember tetra tank mates

Questions

Can rams live with ember tetras?

Yes. Rams and ember tetras make a good pair. Both are fine at 80–84°F. Plan on at least 20 gal.

What temperature suits both rams and ember tetras?

80–84 °F. Rams need 80–86 °F, ember tetras need 73–84 °F.

What size tank do rams and ember tetras need together?

At least 20 gal, set by the german blue ram. Add space for each extra fish.