Can rams live with serpae tetras?

Verdict
No

No. Rams and serpae tetras should not share a tank. No shared temperature. Rams need 80–86°F, serpae tetras need 72–79°F.

German blue ramGerman blue ram80–86°F · pH 5–7 Serpae tetraSerpae tetra72–79°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°German blue ram 80–86°Serpae tetra 72–79°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 6–7German blue ram 5–7Serpae tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

German blue ram · 2.5 inSerpae tetra · 1.75 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

German blue ramSerpae tetra
Temperature80–86 °F72–79 °F
pH5–76–7.5
Adult size2.5 in1.75 in
Minimum tank20 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for serpae tetras

All serpae tetra tank mates

Questions

Can rams live with serpae tetras?

No. Rams and serpae tetras should not share a tank. No shared temperature. Rams need 80–86°F, serpae tetras need 72–79°F.

What temperature suits both rams and serpae tetras?

None. Rams need 80–86 °F and serpae tetras need 72–79 °F, so the ranges do not meet.

What size tank do rams and serpae tetras need together?

At least 20 gal, set by the german blue ram. Add space for each extra fish.