Can paradise fish live with black neon tetras?

Verdict
Yes

Yes, paradise fish and black neon tetras can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

Paradise fishParadise fish61–79°F · pH 6–8 Black neon tetraBlack neon tetra73–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Paradise fish 61–79°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 6–7.5Paradise fish 6–8Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Paradise fish · 3.5 inBlack neon tetra · 1.5 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

Paradise fishBlack neon tetra
Temperature61–79 °F73–81 °F
pH6–85.5–7.5
Adult size3.5 in1.5 in
Minimum tank20 gal15 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for paradise fish

All paradise fish tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can paradise fish live with black neon tetras?

Yes, paradise fish and black neon tetras can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

What temperature suits both paradise fish and black neon tetras?

73–79 °F. Paradise fish need 61–79 °F, black neon tetras need 73–81 °F.

What size tank do paradise fish and black neon tetras need together?

At least 20 gal, set by the paradise fish. Add space for each extra fish.