Can ember tetras live with rummy nose tetras?

Verdict
Yes

Yes. Ember tetras and rummy nose tetras make a good pair. Both are fine at 75–84°F. Plan on at least 20 gal.

Ember tetraEmber tetra73–84°F · pH 5.5–7 Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7

Why it works

Water side by side

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

Size to scale

Ember tetra · 0.8 inRummy nose tetra · 2 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

Ember tetraRummy nose tetra
Temperature73–84 °F75–84 °F
pH5.5–75.5–7
Adult size0.8 in2.0 in
Minimum tank5 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for ember tetras

All ember tetra tank mates

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Questions

Can ember tetras live with rummy nose tetras?

Yes. Ember tetras and rummy nose tetras make a good pair. Both are fine at 75–84°F. Plan on at least 20 gal.

What temperature suits both ember tetras and rummy nose tetras?

75–84 °F. Ember tetras need 73–84 °F, rummy nose tetras need 75–84 °F.

What size tank do ember tetras and rummy nose tetras need together?

At least 20 gal, set by the rummy nose tetra. Add space for each extra fish.