Can boesemani rainbowfish live with black neon tetras?

Verdict
Yes

Yes. Boesemani rainbowfish and black neon tetras make a good pair. Both are fine at 75–81°F. Plan on at least 30 gal.

Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8 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: 75–81°Boesemani rainbowfish 75–82°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 7–7.5Boesemani rainbowfish 7–8Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Boesemani rainbowfish · 4 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

Boesemani rainbowfishBlack neon tetra
Temperature75–82 °F73–81 °F
pH7–85.5–7.5
Adult size4.0 in1.5 in
Minimum tank30 gal15 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can boesemani rainbowfish live with black neon tetras?

Yes. Boesemani rainbowfish and black neon tetras make a good pair. Both are fine at 75–81°F. Plan on at least 30 gal.

What temperature suits both boesemani rainbowfish and black neon tetras?

75–81 °F. Boesemani rainbowfish need 75–82 °F, black neon tetras need 73–81 °F.

What size tank do boesemani rainbowfish and black neon tetras need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.