Can congo tetras live with swordtails?

Verdict
Yes

Yes, congo tetras and swordtails can live together. Both are fine at 73–79°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°F · pH 6–7.5 SwordtailSwordtail72–79°F · pH 7–8.3

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Congo tetra 73–82°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–7.5Congo tetra 6–7.5Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 inSwordtail · 5 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

Congo tetraSwordtail
Temperature73–82 °F72–79 °F
pH6–7.57–8.3
Adult size3.0 in5.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can congo tetras live with swordtails?

Yes, congo tetras and swordtails can live together. Both are fine at 73–79°F. Plan on at least 30 gal.

What temperature suits both congo tetras and swordtails?

73–79 °F. Congo tetras need 73–82 °F, swordtails need 72–79 °F.

What size tank do congo tetras and swordtails need together?

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