Can platies live with congo tetras?

Verdict
Yes

Yes, platies and congo tetras can live together. Both are fine at 73–80°F. Plan on at least 30 gal.

PlatyPlaty70–80°F · pH 7–8.2 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: 73–80°Platy 70–80°Congo tetra 73–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Platy 7–8.2Congo tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Platy · 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

PlatyCongo tetra
Temperature70–80 °F73–82 °F
pH7–8.26–7.5
Adult size2.5 in3.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for platies

All platy tank mates

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can platies live with congo tetras?

Yes, platies and congo tetras can live together. Both are fine at 73–80°F. Plan on at least 30 gal.

What temperature suits both platies and congo tetras?

73–80 °F. Platies need 70–80 °F, congo tetras need 73–82 °F.

What size tank do platies and congo tetras need together?

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