Can rummy nose tetras live with apistogramma?

Verdict
Yes

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

Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7 ApistogrammaApistogramma75–84°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–84°Rummy nose tetra 75–84°Apistogramma 75–84°
The green band is the temperature range both can live in.
456789Both: 5.5–7Rummy nose tetra 5.5–7Apistogramma 5–7
The green band is the pH both tolerate.

Size to scale

Rummy nose tetra · 2 inApistogramma · 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

Rummy nose tetraApistogramma
Temperature75–84 °F75–84 °F
pH5.5–75–7
Adult size2.0 in3.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Better tank mates for apistogramma

All apistogramma tank mates

Questions

Can rummy nose tetras live with apistogramma?

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

What temperature suits both rummy nose tetras and apistogramma?

75–84 °F. Rummy nose tetras need 75–84 °F, apistogramma need 75–84 °F.

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

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