Can gold barbs live with black neon tetras?

Verdict
Yes

Yes. Gold barbs and black neon tetras make a good pair. Both are fine at 73–75°F. Plan on at least 20 gal.

Gold barbGold barb64–75°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: 73–75°Gold barb 64–75°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 6–7.5Gold barb 6–8Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Gold barb · 3 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

Gold barbBlack neon tetra
Temperature64–75 °F73–81 °F
pH6–85.5–7.5
Adult size3.0 in1.5 in
Minimum tank20 gal15 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for gold barbs

All gold barb tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can gold barbs live with black neon tetras?

Yes. Gold barbs and black neon tetras make a good pair. Both are fine at 73–75°F. Plan on at least 20 gal.

What temperature suits both gold barbs and black neon tetras?

73–75 °F. Gold barbs need 64–75 °F, black neon tetras need 73–81 °F.

What size tank do gold barbs and black neon tetras need together?

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