Can platies live with rummy nose tetras?

Verdict
Yes, with care

Yes, with care. Platies and rummy nose tetras can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

PlatyPlaty70–80°F · pH 7–8.2 Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Platy 70–80°Rummy nose tetra 75–84°
The green band is the temperature range both can live in.
456789Both: 7Platy 7–8.2Rummy nose tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

Platy · 2.5 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

PlatyRummy nose tetra
Temperature70–80 °F75–84 °F
pH7–8.25.5–7
Adult size2.5 in2.0 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for platies

All platy tank mates

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Questions

Can platies live with rummy nose tetras?

Yes, with care. Platies and rummy nose tetras can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.

What temperature suits both platies and rummy nose tetras?

75–80 °F. Platies need 70–80 °F, rummy nose tetras need 75–84 °F.

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

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